Slip-up by first baseman gives Rays the chance to take crucial run and 4-3 victory over New York.
MLB round-up: Teixeira blunder gives Tampa Bay advantage over Yankees
Mark Teixeira's first error of the season proved costly for the American League East-leading New York Yankees, with the Tampa Bay Rays capitalising to win 4-3 at Tropicana Field.
The ball slipped under the first baseman's glove with the score tied in the seventh inning, allowing pinch-hitter Brooks Conrad to post the go-ahead run for the Rays.
BJ Upton and Carlos Pena earlier homered for Tampa Bay, who halted a two-game losing run.
Elsewhere, Josh Reddick and Brandon Moss hit home runs against their former team as the Oakland Athletics crushed the Boston Red Sox 6-1.
Mike Moustakas had five RBI and his first career grand slam while Everett Teaford threw seven solid innings as the Kansas City Royals snapped a three-game skid in style, with an emphatic 11-3 triumph over the Toronto Blue Jays.
Also in the American League, the Minnesota Twins saw off the Detroit Tigers 6-4 to give manager Ron Gardenhire his 900th career win, Jered Weaver pitched seven scoreless innings to help the Los Angeles Angels overcome the Indians 3-0 in Cleveland and the Seattle Mariners defeated the Baltimore Orioles 6-3.
In the National League, Luis Valbuena's three-run tiebreaking double in the seventh inning set the Chicago Cubs up for their fourth successive win - 4-1 against the Atlanta Braves.
Back-to-back homers from Garrett Jones and Neil Walker lifted the Pittsburgh Pirates to an 11-2 victory over Houston - the Astros' seventh straight road defeat.
Allen Craig hit two homers and Kyle Lohse gave up two runs on nine hits in 7 1/3 innings in the St Louis Cardinals' 9-3 rout of the Colorado Rockies at Busch Stadium.
Finally, the Cincinnati Reds trounced the Los Angeles Dodgers 8-2, the San Diego Padres won 6-2 against the Diamondbacks in Arizona and the Milwaukee Brewers edged the Miami Marlins 6-5.
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