Carlos Pena hit his AL-best 38th homer and drove in four runs to help the Tampa Bay Rays beat the Detroit Tigers 11-7 on Monday for a split of their four-game series.

Tampa Bay scored six times in the first inning against the AL Central leaders, capped by Pena's two-run drive. James Shields remained unbeaten against Detroit, and Jason Bartlett added a solo homer as the Rays moved within five games of idle Boston in the wild-card race.

Tampa Bay hosts the Red Sox on Tuesday night, the start of a three-game series.

Carlos Guillen had four hits for Detroit, including a pair of two-run homers.

Tigers starter Jarrod Washburn (9-8) allowed his first six batters to reach base. The last was Pena, who hit a shot down the right-field line. Pat Burrell had a two-run double earlier in the inning.

Pena added an RBI double in the fifth and Bartlett homered in the sixth off Washburn, who lost for the second time since joining the Tigers in a July 31 trade with Seattle. He left the mound to a chorus of boos after allowing eight runs and nine hits in 5 2-3 innings.

Pena singled in the first of three Tampa Bay runs off reliever Ryan Perry in the seventh.

Shields (9-10) allowed both two-run homers by Guillen, one in the first and another in the seventh, but had little trouble in between. The right-hander yielded four earned runs in seven innings and struck out six to win his second consecutive outing and improve to 3-0 in five career starts against the Tigers.

Guillen had his sixth career multihomer game. Detroit got its last two runs in the ninth off reliever Brian Shouse.

NOTES: Guillen also had his eighth career four-hit game. ... Tigers RHP Jeremy Bonderman (shoulder) will be activated from an injury rehab assignment Tuesday but will not be used as a starter, manager Jim Leyland said. With rosters expanding to 40, the club also will promote pitchers Eddie Bonine and Casey Fien, C Dusty Ryan, OF Wilkin Ramirez and SS Brent Dlugach from Triple-A Toledo. ... Tampa Bay RHP Andy Sonnanstine will be recalled Tuesday from Triple-A Durham to start against Boston. The Rays also will call up C Shawn Riggans, OF Fernando Perez and RHP Jeff Bennett.