Christian Walker singled home the go-ahead run in the ninth inning and the Houston Astros beat the Arizona Diamondbacks 4-3 on Wednesday to complete a three-game sweep. Zack Short and Taylor Trammell started the ninth with bunt singles against Kevin Ginkel (1-4).

When the Arizona Diamondbacks play their next game at Chase Field after the trade deadline, they may look like a different team.

With his team up 4-3 in the bottom of the ninth inning, closer Josh Hader delivered a 3-2 pitch to Diamondbacks second baseman Ketel Marte—one that was pretty clearly a ball and would have put runners on first and second. Walsh, however, saw it differently, and rung up Marte to give Houston the win. Pretty clearly a ball.

The Diamondbacks lost a third straight close game to the Astros, getting swept in their final home series before the trade deadline.

The Arizona Diamondbacks were swept by the Houston Astros by a score of 4-3 on Wednesday, ending a demoralizing three-game set on a sour note. Brandon Pfaadt pitched well until the sixth inning, but familiar bullpen and offensive woes made the ultimate difference.

The Diamondbacks open a three-game series with the Houston Astros at Chase Field with Arizona's Zac Gallen facing Houston's Colton Gordon.