Rivas got the Pirates on the board with an RBI single in the fourth inning.
The Reds dropped 2 1/2 games behind the Chicago Cubs in the chase for the final wild-card spot in the National League.
Athletics 4, Tigers 1Trevor May pitched out of bases-loaded jams in the eighth and ninth innings, preserving Joe Boyle's first major league win, as Oakland defeated visiting Detroit.
Stroman was relieved by Javier Assad (5-3), who threw four scoreless innings, allowing two hits with six strikeouts and no walks.
Mookie Betts drove in two runs for a major league record 105 RBIs from the leadoff spot.
Persons:
Jordan Montgomery, Kevin Jairaj, Alfonso Rivas, Rivas, Bryan Reynolds, Ji Hwan, Christian Encarnacion, Strand, Bailey, Strand's, Montgomery, Dylan Moore, Julio Rodriguez, Louis, Josh Lowe, Chris Devenski, Junior Caminero, Bo Bichette, Vladimir Guerrero Jr, Cavan Biggio, Luis Robert Jr, Josh Winckowski, Statcast, Dylan, Nick Pivetta, Pivetta, Jo Adell, Brandon Drury, Kyle Farmer, Christian Vazquez, Trevor May, Joe Boyle's, Esteury, Boyle, Jordan Diaz, Joey Wentz, Miguel Diaz, Jake Burger, Josh Bell, Bryan De La Cruz, Carlos Santana, Nico Hoerner, Christopher Morel, Miles Mastrobuoni, Marcus Stroman, Stroman, Javier Assad, Bryce Harper, Alec Bohm, Zack Wheeler, Jose Quintana, Taylor Clarke, Richie Palacios, Palacios, Luken Baker, Andrew Knizner, Ryan Helsley, Eguy Rosario, Xander Bogaerts, Helsley, Fernando Tatis Jr, Juan Soto, John Means, Anthony Santander, Andres Gimenez, Tommy John, Clayton Kershaw, Kershaw, Mookie Betts, Martinez
Organizations:
Texas Rangers, Seattle Mariners, Life, Pittsburgh Pirates, Cincinnati, Reds, Pirates, Chicago Cubs, National League . Rangers, Mariners, Seattle, Rangers, American League West, Houston Astros, Rays, Blue Jays, Tampa Bay, Cavan, White Sox, Red Sox, Boston, Chicago, Angeles, Angels, Minnesota, American League Central, Athletics, Tigers, Oakland, Detroit, Marlins, Brewers, Miami, Milwaukee, NL, Friday, Cubs, Rockies, Colorado, Miami Marlins, National League, Phillies, Mets, Philadelphia, League, New York, Royals, Astros, Kansas City, Houston, Seattle . Cardinals, Padres, Orioles, Baltimore, Cleveland, Dodgers, Giants, Francisco, Los, The Giants, Thomson
Locations:
Arlington , Texas, USA, Encarnacion, Texas, Montgomery, St, Toronto, St . Petersburg, Fla, Chicago, Minnesota, Minneapolis, Angeles, Houston, Diego's, San Francisco, Los Angeles