Phoenix ? Mark Mulder allowed one run and four hits in four innings Tuesday as the Oakland Athletics beat the Kansas City Royals, 4-3.

A’s third base coach Ron Washington had to leave in the later innings because of what was believed to be a kidney stone. He was taken to a hospital for observation.

Adam Morrissey singled with two outs in the ninth inning to drive in the winning run for Oakland.

Loser Jeremy Hill allowed Mike Edwards’ single and Rontrez Johnson’s double before Morrisey’s hit.

A’s starter Tim Hudson gave up two runs and three hits in four innings, while Royals starter Runelvys Hernandez pitched three shutout innings, giving up one hit.

Mendy Lopez, Carlos Beltran and Dee Brown each drove in runs as the Royals took a 3-0 lead into the seventh.