BERLIN - Borussia Dortmunds Bundesliga troubles continued Saturday with a 1-0 loss at home to Hannover, the sides fourth straight league defeat.Dortmund, the 2011 and 2012 league champion, was left to rue a host of missed opportunities when Japan midfielder Hiroshi Kiyotake struck a precise free kick over the wall and inside the corner in the 61st minute.Hannover goalkeeper Ron-Robert Zieler produced a string of saves to deny the home side. Hannover finished with 10 men after Ceyhun Gulselam got his second yellow card in the 89th.Elsewhere, Stuttgart edged a nine-goal thriller 5-4 at Eintracht Frankfurt, Augsburg defeated Freiburg 2-0, Hertha Berlin routed Hamburger SV 3-0 and unbeaten Hoffenheim defeated promoted Paderborn 1-0 to go provisionally second.Hakan Calhanoglus perfect free kick in the 53rd gave Bayer Leverkusen a deserved 1-0 win over Schalke in the late game. Leverkusen defender Tin Jedvaj earned a direct red for a wild tackle on Jan Kirchhoff with five minutes to play.It was a tactical game with few chances decided by a set piece, Schalke striker Klaas Jan Huntelaar said. We didnt play enough football.Leverkusens first victory after three draws propelled the side provisionally fourth, while Schalke dropped to 12th after Roberto di Matteos first defeat in his third game as coach.Earlier, bottom side Werder Bremen fired coach Robin Dutt and appointed Viktor Skripnik, its under-23 coach, in his place.Dortmunds players lined up in their Champions League jerseys, hopeful of bringing European form — three wins from three games — to the Bundesliga, which the club has started as badly only twice before.Juergen Klopps side dominated the first half in terms of possession and chances but again the effort failed to yield goals.We had four or five clear chances, but didnt put the ball in, Klopp said.Zieler denied Henrikh Mkhitaryans effort in the 12th and Germany teammate Mats Hummels header six minutes later.Marco Reus almost made the breakthrough toward the end of the half when he shot narrowly over, and Zieler produced another top save to deny Reus early in the second.Kiyotakes expertly taken spot kick was Hannovers first away goal of the season, while Dortmunds fifth defeat in six games left it just one point above Hamburg in the relegation zone.Well keep fighting, Klopp said.Christian Gentner was the hero for Stuttgart, which twice came from behind to win on coach Armin Vehs return to former club Frankfurt.It was a crazy game, Veh said.Alexander Madlung opened the scoring on a rebound after Haris Seferovics initial header struck the crossbar in the 21st, but Stuttgart striker Martin Harnik scored twice in three minutes to put the visitors ahead in the 37th. TV replays showed Harniks first goal should have been ruled out for offside, however.Gentner thought hed sealed the result when he curled his shot inside the far post to make it 3-1 in the 51st.But Alexander Meier pulled one back six minutes later, Stefan Aigner scored four minutes later and Madlung claimed his second four minutes after that to make it 4-3 to Frankfurt.With Frankfurt pushing for a fifth, the 18-year-old Timo Werner equalized after a great solo run in the 81st, and Gentner struck again three minutes later for the winner.Seferovic earned a direct red card a minute later for suggesting to a linesman that he needed glasses.Its not easy to smile after such a game, Frankfurt coach Thomas Schaaf said.Kevin Vollands 73rd-minute strike was enough for Hoffenheim to move three points behind league leader Bayern Munich, which visits Borussia Moenchengladbach on Sunday.In Berlin, Anis Ben-Hatira opened the scoring against Hamburg in the 59th, John Heitinga made it 2-0 six minutes later, and Ben-Hatira sealed Herthas third win of the season by claiming his second with five minutes remaining.Augsburg won thanks to an 11th minute penalty from Paul Verhaegh and second half goal from Halil Altintop. 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Now, we all know youve played the role of Andre 3000 in the past, does that mean Outkast is getting your vote?AJ: You know it, you know it.Lewis Hamilton responded to Nico Rosbergs strong start to the weekend by dominating Practice Two at the Russian GP. The world champion was quickest in all three sectors to set a fastest lap time of 1:37.583 on the supersoft tyre, almost 0.9 seconds clear of his Mercedes team-mate, who finished third behind Sebastian Vettel.Vettel was around seven tenths adrift of Hamilton though his session was cut short after an electrical failure in the Ferrari as the German was forced to pull up on the pit straight, and was soon pushed back to the garage by stewards. The Ferrari drivers problems in Sochi were then compounded by a five-place gearbox change grid penalty.Rosberg, who has won the first three races of the season, topped the timesheets in P1 but wasnt able to set a representative time on the quicker tyre later on Friday and seemed to be held up in traffic, with Kimi Raikkonen and Daniel Ricciardo ending the session in fourth and fifth. Whens the Russian GP on Sky? The Russian GP is live and exclusive on Sky Sports - find out how you can watch it. Hamilton didnt completely avoid issues, struggling along with many other drivers with a lack of grip around the former Winter Olympics venue, while his W07 was also stuck in the pits with a hydraulics problem for part of the afternoon. However, he was able to pull everything together for a superb flying lap on the red-marked compound.Mercedes and Ferrari spend their first in-season engine tokens Much like earlier in the day, Mercedes seemed to hold a distinct advantage over Ferrari and were more than half a second faster on both the soft and supersoft tyre. Mercedes driver Lewis Hamilton is happy with the pace he set on Fridays Practice 1 and 2 in the Russian GP. Both teams have spent their first in-season engine tokens, with the Silver Arrows focusing on fuel-system improvements while Vettel and Raikkonen will race with new internal combustion engines. But the Scuderias afternoon was once again dogged by reliability issues.Vettel groaned that he had lost electronics after grinding to a halt on the start-finish straight and while he was wheeled back to the pits, a red ERS light flashing on the car meant it was not safe to touch. Mechanics worked on the SF16-H with insulation gloves on for the rest of the session. Vettel and Raikkonen have both registered a DNF apiece in the opening three rounds and the Scuderia will hope it is a minoor electrical issue on the car, rather than anything related to Vettels third engine of the season.ddddddddddddATCH: Red Bull test new canopyIt seems to be every single weekend theres some reliability issue affecting that Ferrari power unit, Sky Sports F1 commentator David Croft said.Vettel, meanwhile, added: The balance was not quite where I wanted it to be, but the circuit should come our way. It was quite slippery. Lacking a bit of information from my side but other people did their homework and hopefully we can copy that a bit. Ferrari driver Sebastian Vettel is unsure what caused his electrical failure in Practice 2 of the Russian GP The second half of P2 saw teams focus on longer stints with the race again expected to be a one-stop affair. Ricciardo, after his earlier eye-catching lap trialling the Red Bull canopy, displayed remarkable consistency in comparison to Raikkonen, who struggled with tyre wear.There was another promising Friday performance for McLaren as Jenson Button finished just three thousandths of a second behind Daniil Kvyat in eighth, with Fernando Alonso two tenths slower in 10th.Haas, meanwhile, werent able to replicate their early-season form once again, with Romain Grosjean reporting that something isnt working on the car since China. He and Esteban Gutierrez finished P16 and P17 respectively.Practice Two timesheet1. Lewis Hamilton, Mercedes, 1:37.5832. Sebastian Vettel, Ferrari, 1:38.2353. Nico Rosberg, Mercedes, 1:38.4504. Kimi Raikkonen, Ferrari, 1:38.7935. Daniel Ricciardo, Red Bull, 1:38.7936. Valtteri Bottas, Williams, 1:39.1857. Daniil Kvyat, Red Bull, 1:39.1938. Jenson Button, McLaren, 1:39.1969. Felipe Massa, Williams, 1:39.28910. Fernando Alonso, McLaren, 1:39.40011. Carlos Sainz, Toro Rosso, 1:39.46512. Max Verstappen, Toro Rosso, 1:39.50113. Nico Hulkenberg, Force India, 1:39.79514. Sergio Perez, Force India, 1:39.86715. Kevin Magnussen, Renault, 1:40.19316. Romain Grosjean, Haas, 1:40.26017. Esteban Gutierrez, Haas, 1:40.50818. Jolyon Palmer, Renault, 1:40.68819. Felipe Nasr, Sauber, 1:40.74020. Rio Haryanto, Manor, 1:41.08021. Pascal Wehrlein, Manor, 1:41.14822. Marcus Ericsson, Sauber, 1:41.652Watch the whole Russian GP weekend - LIVE ONLY on Sky Sports F1. The race begins at 1pm on Sunday, with build-up from 11.30am. Or watch the race without a contract for £6.99 on NOW TV. Every race live in 2016 Sky Sports F1 brings you every race live in 2016. Fast and easy online upgrade - click here. Also See: P1: Rosberg outpaces Hamilton When is the Russian GP on Sky? 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