Darvish says no.
"I don't really have to," Darvish said Friday through an interpreter. "I'm going to keep doing what I'm doing. I'm going to keep making adjustments depending on the opponent."
Darvish is throwing his four-seam fastball 15 percent less than he did last season, according to Fangraphs.com. He is using it 32.3 percent of the time, down from 47.3 percent last season.
Add in his cut fastball, which he has thrown 18 percent of the time, and it's basically 50-50 as far as fastballs and off speed pitches.
Darvish, who hasn't won in his last seven starts, has thrown more of his secondary pitches (381) than fastballs and cutters (375) during his winless streak.
Rangers manager Ron Washington said Wednesday that Darvish may have to change his way of doing things.
“Teams are making adjustments," Washington said. "He may have to change up something. It’s a game of constant adjustments. They adjust to him and he has to adjust to them.”
Darvish has met with pitching coach Mike Maddux in between starts, but he didn't reveal what they talked about.
"We've had a conversation with him," Washington said, eluding to Maddux talking to the Rangers' ace.
Washington had a heart-to-heart talk with Darvish last August in Boston and Darvish finished the season with a flourish, going 6-2 and pitching well in the Rangers' wildcard loss.
Washington said he hasn't felt the need to have a conversation with Darvish.
"We're not there yet," Washington said.
Darvish dismissed talk of poor body language impacting his performance in his start against the Yankees. He was visibly frustrated several times during the game.
"If you gave up three home runs like that, I think every pitcher is going to be frustrated," Darvish said.
Darvish, who is 7-3 with a 2.95 ERA and a major-league leading 143 strikeouts, said Friday he isn't concerned about making the All-Star team.
"I'll be good either way," Darvish said. "If I don't get selected, I'll rest. If I do get selected, I'll get to play with the greatest players in baseball. If I haven't won this many games I won't be selected."