With one out and the bases loaded, the Mets say, Rivas gave birth to Jeurys Familia Jr. Moments later, the elder Familia induced a game-ending double play, then bolted from the stadium to join Rivas at the hospital.
A day later, the Mets had no plans to place Familia on the paternity list, which requires a one- to three-day absence. But Familia, who threw 39 pitches combined on Thursday and Friday, was not necessarily available for a save situation Saturday. Manager Terry Collins said he planned to mix and match in the ninth inning, with Bobby Parnell and lefty Sean Gilmartin serving as options.
Familia became the second Mets player to welcome a child this week. On Thursday, infielder Ruben Tejada's girlfriend gave birth to the couple's first daughter, Smarjorie Thalia Tejada. Tejada is due back from paternity leave Sunday.
Anthony DiComo is a reporter for MLB.com. Follow him on Twitter @AnthonyDiComo and Facebook, and listen to his podcast. This story was not subject to the approval of Major League Baseball or its clubs.