HOUSTON -- Rockies infielder Chris Nelson was given permission to leave the team on Sunday afternoon to be with his ill mother in Atlanta, Rockies manager Jim Tracy said before Sunday's game against the Astros.

Nelson has hit .250 with four home runs and 16 RBIs in 63 games with the Rockies. Nelson played mostly second base. In his final start of the season on Saturday night, Nelson started at shortstop, hit cleanup and drove in the winning run with a 13th-inning walk.

Since being recalled on Sept. 9, Nelson played through the pain of a left heel injury and hit .375 (9-for-24) with two home runs and four RBIs.

Iannetta makes final start at catcher

HOUSTON -- Sunday was the final start of the season at catcher for the Rockies' Chris Iannetta, manager Jim Tracy said.

Tracy wanted Iannetta, who caught 13 innings on Saturday night, to work with veteran Kevin Millwood. The Rockies finish the year with three games at San Francisco starting Monday, but with both teams out of playoff contention Tracy said he wants to see Wilin Rosario and Jordan Pacheco work behind the plate. Tracy did open the possibility of him playing at another spot, such as first base.

Iannetta entered Sunday with a .998 fielding percentage in 104 games behind the dish. His percentage topped all Major League catchers with 100 games played. Iannetta also had thrown out a healthy 30.3 percent of would-be base-stealers (30 of 69).

With team success and, oddly, offense being factors in Rawlings Gold Glove Award voting among National League managers and coaches, Iannetta said there was "not a chance" he would receive much consideration for the award.

Still, Iannetta said he worked on improving his target and his footwork during the course of the season, and it paid off.

"It was a combination of a lot of things I worked on, but regular playing time was the biggest thing," Iannetta said.