HOUSTON -- Astros outfielder Justin Maxwell had treatment on his injured left ankle on Saturday night. Maxwell has been dealing with bone spurs in the ankle for the last few days.

Manager Brad Mills said Maxwell was available to pinch-hit on Sunday, but he wouldn't put Maxwell in if the ankle was bothering him.

"It might be kind of difficult for him to make an appearance today," Mills said.

Maxwell said the ankle felt better after the treatment. Neither Mills or Maxwell would comment on the exact type of treatment Maxwell received.

Maxwell was batting .233/.326/.475 entering Sunday. He hasn't played since Friday, when he pinch-hit.

Mills diagnoses difference in Martinez's swing

HOUSTON -- Astros manager Brad Mills and outfielder J.D. Martinez sat down in Mills' office on Saturday and discussed the differences between Martinez's swing in 2011 and his swing in '12.

Mills pulled up video of Martinez's swing from last season and this season on his laptop, noting some differences. The immediate results were promising. Martinez hit a two-run homer in the fifth inning on Saturday and a two-run homer in the eighth inning on Sunday.

Mills wouldn't divulge his diagnosis of Martinez's swing, but he did say the talk mostly centered around Martinez's ability to recognize and react to pitches.

"The only way you can put yourself in a position to make those adjustments is if you give yourself time to be able to make those adjustments," Mills said. "To be able to do that, you have to be on time."

Martinez plants his front foot early, using his hands as his timing mechanism.

"It just felt to me that he wasn't allowing himself to adjust on any of the pitches," Mills said. "If a particular pitch was a particular speed in a particular spot, he was going to hit it pretty good. But if it wasn't, he was going to be in trouble." Martinez was batting .230/.318/.391 heading into Sunday's matinee. He batted .274/.319/.423 in '11.

Worth noting

• Bud Norris, on the disabled list since June 12 with a sprained left knee, threw 75 pitches in his rehabilitation start at Triple-A Oklahoma City on Saturday. He went five innings, giving up two runs. He struck out seven and walked three.

Manager Brad Mills said Norris was set to fly back to Houston on Sunday. The Astros will evaluate him Monday and determine if he is ready to make his next start. He is set to come off the disabled list on Wednesday.

• Originally a spot starter to fill Norris' spot in the rotation, Dallas Keuchel may force the Astros' hand with two solid starts in the last week.

Mills said he would use the next few days to evaluate where Keuchel might fit on the roster. The last pitcher to throw a complete game in their first or second Major League appearance was Boston's Clay Buchholz, who threw a no-hitter on Sept. 1, 2007.

• The Astros signed eighth-round pick Tyler Heineman, a catcher from UCLA. Terms were not disclosed. He was assigned to Tri-City, the Astros' Class A short season affiliate.