Burrows (elbow) threw 55 pitches over three innings at the Astros' complex Saturday and will next make a rehab start with Triple-A Sugar Land, Chandler Rome of The Athletic reports.
Diaz isn't in the starting lineup Saturday versus San Diego.
Javier will start Sunday's game against San Diego, Chandler Rome of The Athletic reports.
The Rockies reinstated Castano (pectoral) from the injured list Saturday and optioned him to Triple-A Albuquerque.
Smith went 3-for-4 with two solo home runs and an additional run scored in Friday's 6-3 win over the Padres.
Blanco allowed three runs on four hits and three walks while striking out one over 4.2 innings Friday against the Padres. He did not factor into the decision.
Hader struck out one in a perfect ninth inning to earn the save in Friday's 6-3 win over the Padres.
Abreu (4-3) walked one and struck out two over 1.1 scoreless innings to earn the win in Friday's 6-3 victory over the Padres.
Johnston went 0-for-2 with two RBI on Friday against the Cardinals.
Rumfield went 3-for-4 with two runs scored in a 3-2 loss to the Cardinals on Friday.
