Sources - Astros, Christian Walker reach 3-year, $60M deal - ESPN

The Houston Astros and free agent first baseman Christian Walker have agreed to a three-year, $60 million contract, sources confirmed to ESPN amid multiple reports Friday.

The deal is pending a physical exam, a source told ESPN.

The addition of Walker in all likelihood marks the end of Alex Bregman's tenure in Houston, not to mention the Astros' ill-fated attempts to pry Nolan Arenado from the St. Louis Cardinals. Walker manning first base for the next three years means Isaac Paredes, the 25-year-old corner infielder who was recently acquired from the Chicago Cubs in the Kyle Tucker trade, will probably be Bregman's replacement at third base.

Walker, who turns 34 on March 28, is widely regarded as one of the sport's best defensive first basemen and will also provide some power to the middle of the Astros' lineup. He slashed .250/.332/.481 with 95 home runs and 281 RBIs with the Arizona Diamondbacks over the past three seasons while accumulating 10.8 FanGraphs wins above replacement, sixth-most among first basemen.

First base had been a conundrum in Houston over these past three seasons, one the high-priced Jose Abreu could not solve. Astros first basemen combined for a .651 OPS last season, fifth-lowest in the majors. Walker, a three-time Gold Glove Award winner, will provide a major boost at that position — particularly as a right-handed hitter in Daikin Park, which features a short left-field fence.

The Astros still need help in their outfield after parting with Tucker one year before he's scheduled to become a free agent. And Bregman, the heart and soul of an Astros franchise that won two championships and made seven straight appearances in the American League Championship Series dating back to his first full season