Worth noting

• Right-hander Josh Fields, taken by the Astros in the Rule 5 Draft, has appeared in four games at Double-A Corpus Christi during his rehab assignment from a right forearm strain suffered in the first week of the season. Manager Bo Porter said the club would like to see Fields work consecutive games without any setbacks and hopes to make a decision on him within the next week.

• Porter said he still anticipates right-hander Bud Norris will make his next start despite leaving his last two with back tightness. Norris had a massage on Thursday's off-day and threw in the bullpen on Friday without incident.

• First baseman Jonathan Singleton, the top prospect in the Astros system, will begin his season Monday at Class A Quad Cities, general manager Jeff Luhnow said. He began the year with a 50-game suspension following his second positive drug test. Singleton will move to Double-A Corpus Christi and Triple-A Oklahoma City before possibly being called up in September.