Villar hit. 284 with seven doubles, two homers and 11 RBIs in 53 games for the Astros last season. The 24-year-old appeared in 198 games for Houston in the last three seasons.
Sneed had a 2.58 ERA in 23 starts and three relief appearances for two Class A teams last season. The 23-year-old right-hander was a third-round pick in the 2014 amateur draft.
Cruz was 7-5 with a 4.27 ERA in 28 games for Triple-A Fresno last season. Grossman spent most of the season at Fresno, but appeared in 24 games for Houston.