Jorge Posada turned in a career-best performance in front of a special audience.
"I've got my dad in the stands and its nice to get a game like that when he's here," said Posada, whose career-high six RBI helped the New York Yankees to a 14-1 victory over the Kansas City Royals on Saturday.
Posada's outburst helped Orlando Hernandez (7-3) to his fourth victory in five decisions. Hernandez held the Royals to four hits and a walk in eight innings, striking out seven.
"That's the best I've seen him pitch this year," Posada said.
Hernandez, who threw 106 pitches, attributed his improvement to a slight change in his technique. Since allowing 13 hits and 10 runs in 3 1/3 innings against Anaheim on July 29, Hernandez has given up seven hits and two runs in 17 innings.
"I have improved, I think, in throwing the inside fastball to left-hand hitters," Hernandez said.
New York has outscored Kansas City 36-5 in the first three games of this series and have scored 71 runs in their last seven games as they have pushed their record to 54 games over .500.
"It becomes a morale factor. We were playing pretty good when we got here," said Royals manager Tony Muser, whose club won three straight before dropping Friday's doubleheader to the Yankees. "It's probably as good starting pitching as we've run into all season," Muser said.
Jose Offerman was held hitless in three at-bats, ending his 27-game hitting streak -- second longest in the AL this season and the second longest in Royals club history.
"It's a difficult atmosphere to keep something going. The timing was bad in this ind of a game," said Muser of Offerman, whose streak is only exceeded by George Brett's 30 in 1980.
"He's a guy who throws a lot of different pitches. It was a little hard to figure out the way he throws," Offerman said of Hernandez.
Offerman's last at-bat in the ninth was a grounder to reliever Mike Jerzembeck, who pitched a 1-2-3 ninth in his major-league debut.
On pace to the break the 1906 Chicago Cubs' record of 116 wins, the Yankees will play 32 of their final 50 games at Yankee Stadium, where they are 41-8.
Posada went 3-for-5 with a two-run single in the sixth, and two-run doubles in the seventh and eighth.
After Posada's single in the sixth off Glendon Rusch (6-15) made it 4-1, rookie Shane Spencer hit an RBI double, his fifth extra-base hit in the last two games. Brosius then hit a 2-2 pitch by Rusch into the left-field stands for his 11th homer.
Rusch allowed eight runs -- seven earned -- on eight hits in 5 1/3 innings as he lost his sixth straight decision.
Brosius scored the Yankees first run when he walked leading off the third inning, stole second and continued to third on a throwing error by Royals catcher Mike Sweeney. Brosius came home when Derek Jeter was safe on third baseman Scott Leius' throwing error.
Chuck Knoblauch hit his 11th homer since July 10, and 15th of the season with two out in the fifth inning to give the Yankees a 2-0 lead. The Royals made it 2-1 on Hal Morris' RBI single in the sixth.
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