Fabio Castro's first five relief appearances this season, when the erratic lefty walked five batters in 3 1/3 innings, earned him a demotion to Triple-A Ottawa.
The Phillies hope Castro has figured out enough with the Lynx to help the team reach the postseason for the first time since 1993. He's being counted on in the final game of the series against the Dodgers.
Castro was placed in the Lynx rotation last month, and has posted a 4.23 ERA in six starts.
"We'll find out [if he's ready]," assistant general manager Ruben Amaro Jr. said. "Fabio's been in the big leagues. He's pitched in tight situations last year. We'll give him the ball and see how he handles it."
Los Angeles counters with Chad Billingsley, a righty who has lost four consecutive decisions. Billingsley has a 7.20 ERA in one career start against the Phillies without a decision.
PHI: LHP Fabio Castro (0-0, 12.27 ERA)
Has never faced the Dodgers.
LAD: RHP Chad Billingsley (7-4, 3.63 ERA)
Lefties are hitting .287 off Billingsley.
Player to watch
Tadahito Iguchi is batting .280 in August.
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Official game notes
WPHT 1210, WUBA 1480 (Español)
Friday: Phillies (Kyle Lohse, 4-12, 4.61) vs. Padres (Greg Maddux, 9-9, 3.90), 7:05 p.m. ET
Saturday: Phillies (Jamie Moyer, 11-9, 4.97) vs. Padres (Clay Hensley, 2-3, 6.70), 7:05 p.m. ET
Sunday: Phillies (Kyle Kendrick, 6-3, 4.06) vs. Padres (TBD), 1:35 p.m. ET
Ken Mandel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.