Liverpool and Arsenal returned to winning ways Saturday to assert their Premier League title credentials, while Hull lost its third straight match after an impressive start to its debut campaign in the top flight. Robbie Keane scored his first two league goals since joining Liverpool in the offseason in a 3-0 victory over West Bromwich Albion. Samir Nasri also had a double, leading Arsenal to a 2-1 victory over defending champion Manchester United and easing the pressure on manager Arsene Wenger by snapping a three-match winless streak in all competitions. Liverpool leads the standings by three points ahead of Chelsea, which is at Blackburn on Sunday. The Gunners moved over United into third place. Bolton saw off Hull 1-0 courtesy of Matt Taylor's 50th-minute goal, while Portsmouth won for the first time since Tony Adams replaced Harry Redknapp two weeks ago. Jermain Defoe converted a 90th-minute penalty to beat Sunderland 2-1. Everton rallied with three goals in the last seven minutes to beat West Ham 3-1, and Wigan and Stoke played out a 0-0 draw. Liverpool was dominating West Brom, but took until the 34th to take the lead when Steven Gerrard pierced the visiting defense with a precision pass to Keane, who lofted over advancing goalkeeper Scott Carson. Carson was again stranded on the edge of the area after Fabio Aurelio's pass split the defense two minutes before the break, allowing Keane to round the former Liverpool goalkeeper to score his second. Keane was denied a hat trick when manager Rafa Benitez replaced him in the 72nd with Fernando Torres, who returned from injury. Alvaro Arbeloa curled in the third goal in the 90th. Arsenal's victory over United banished questions marks over Wenger's future after 12 years in charge. The Gunners had drawn 0-0 with Fenerbahce in the Champions League, been held 4-4 by fierce rival Tottenham and lost 2-1 at Stoke in their last three games. Nasri, an offseason signing from Marseille, halted the slump with Emmanuel Adebayor and Robin van Persie ruled out. United's failure to score until the match entered its final minutes wasn't through a lack of opportunities. With Wayne Rooney and Cristiano Ronaldo finding the target elusive, they were upstaged by an 18-year-old defender. Rafael da Silva, who replaced Neville in the 63rd, chested down William Gallas' half-clearance and volleyed past Almunia for a consolation goal. Bologna holds Roma In Italy, AS Roma's Serie A troubles continued as Cicinho scored an own goal in the 90th minute to give Bologna a 1-1 draw Saturday. After losing four straight games in the league, Roma looked set to take three points and build on the momentum from its Champions League win over Chelsea until Cicinho dove to head in a cross from Bologna forward Marco Di Vaio. Roma captain Francesco Totti had put the visitors ahead in the 68th, using expert control and an accurate shot from an angle that deflected in off the knee of Bologna goalkeeper Francesco Antonioli. Roma remained just above the relegation zone with eight points, while Bologna is right behind with seven. Roma goalkeeper Alexander Doni was carried off on a stretcher with a cut to his head after putting himself in the way of Marco Di Vaio in the 63rd. Another Brazilian keeper, Arthur, replaced Doni. Also Saturday, Austria midfielder Juergen Saumel scored in the 89th minute for Torino to beat 10-man Palermo 1-0 and distance itself from the relegation zone.