Houston ? Craig Biggio feels he has nothing left to prove on a baseball field.

After a 20-year career in which he stayed with one franchise, played multiple positions at an All-Star level and joined the elite 3,000 hit club, the Houston Astros infielder said Tuesday he will retire at the end of this season.

“There are a lot of guys that have the game taken away from them by injury,” he said. “For me to be able to walk away now, on top, on my own accord, I’m very happy with that. I’m in a good place. I think I’ve done everything that I was supposed to do on a baseball field. I have nothing to be disappointed about.”

During a news conference in which he reminisced about his accomplished career, Biggio said his favorite baseball memory always will be from this June 28.

“The 3,000th-hit night was the best. I’ll never forget that,” he said. “I just can’t believe it’s over. It’s gone by fast. I have no regrets. I played the game the right way.”

Biggio is batting .250 with 24 doubles, six homers and 35 RBIs this season. He has 3,016 hits, four shy of tying Rafael Palmeiro for 23rd place.

A teary-eyed Biggio, the longest-tenured player in Astros history, said he will miss putting on his uniform every day and also will miss the fans.

“I just didn’t want families bringing their kids to the game and saying, ‘He’s just not the same guy we used to watch or the guy we really love and respect.’ I didn’t want that. I didn’t want to be a player that played the game too long,” he said.

Along with teammate and friend Jeff Bagwell, who retired before the start of this season, Biggio led the Astros to four division titles, the team’s first NL pennant and a trip to the World Series in 2005.