May 18: P Matt Nevarez placed on 7-Day DL with an unspecified injury
May 18: P Erik Stiller assigned to Corpus from Houston
This would lead me to believe that the Astros had signed pitcher Erik Stiller, who has pitched the last two seasons for Cleveland's Double-A team in Akron. Ohio.com is reporting that the Indians had released Stiller five days ago. Stiller was 1-0 in eight appearances for the Aeros, striking out 12 and walking three. He had a 3.86 ERA and an even 1.00 WHIP.
He has a career 3.58 ERA / 1.17 WHIP in 291.2IP, with a 2.79 K:BB ratio.
May 17: Michael Garciaparra assigned to Round Rock from Corpus Christi
May 17: Released C Jose Lopez
May 19: Placed Dan Sarisky on the 7-Day DL with an unspecified injury
May 19: Assigned P Luis Cruz to Lexington from Greeneville