Chicago then erased a 6-2 hole by scoring four times against Guardians All-Star closer Emmanuel Clase in the ninth.
Boston right-hander Garrett Whitlock (right elbow tightness) allowed one run before being removed after the first inning, and Chris Martin (2-1) earned the win with a 1-2-3 eighth.
Blake Sabol hit a two-run, pinch-hit homer as part of the Giants' short-lived, three-run rally in the seventh.
Matching a season high with seven innings, Singer allowed one run on four hits to collect his first win since June 4.
In 3 2/3 innings, Los Angeles starter Tony Gonsolin (4-3) allowed four runs on six hits with three walks and three strikeouts.
Persons:
Josh Naylor, Naylor, Adbert Alzolay, Sam Hentges, Aaron Civale, Christopher Morel, Chicago, Emmanuel Clase, Jared Young, Cam Gallagher, Trey Mancini, Cody Bellinger, Alex Verdugo, Jarren Duran, Garrett Whitlock, Chris Martin, Verdugo, Jordan Romano, Brandon, Pete Alonso, Alonso, Tommy Pham, hadn't, Blake Sabol, Luis Matos, Jordan Westburg, Aaron Hicks, Jhoan Duran, Felix Bautista, Sonny Gray, Willi Castro, Cole Irvin, Tyler Stephenson, Nick Martinez, Stephenson, Joey Votto, Andrew Abbott, Seong Kim, Fernando Tatis Jr, William Contreras, Monasterio, Colin Rea, Devin Williams, Nick Gonzales, Josh Palacios, Orlando Arcia, Ozzie Albies, Travis d'Arnaud, Spencer Strider, Sandy Alcantara, Stone Garrett, Jeimer Candelario, Trevor Williams, Nick Castellanos, Realmuto, Bryce Harper, Brandon Marsh, Ranger Suarez, Brady Singer, Nicky Lopez, Singer, Maikel Garcia, Tony Gonsolin, David Peralta, Jordan Montgomery, Louis, Brendan Donovan, Gerrit Cole, Gleyber Torres, Chas McCormick's, McCormick, Josh Sborz, Hector Neris, Aroldis Chapman, Andrew Heaney, Shohei Ohtani, Mickey Moniak's, Zac Gallen, Moniak, Jose Caballero, Eugenio Suarez, Tom Murphy, Andres Munoz, Paul Sewald, Randy Arozarena, Isaac Paredes, Jason Adam, Zach Remillard, Jake Burger, Eloy Jimenez, Tony Kemp, JJ Bleday, Seth Brown, Brent Rooker, Tyler Wade, Javier Baez, Jake Marisnick, Spencer Torkelson, Kerry Carpenter, Jake Rogers, Zach McKinstry, Matt Vierling, Matt Manning, Randal Grichuk, Ryan McMahon, Harold Castro, Kris Bryant, Jurickson, Connor Seabold
Organizations:
Cleveland Guardians, Chicago Cubs, Chicago, Cleveland, Cubs, Red Sox, Blue Jays, Boston, Toronto, Brandon Belt, Mets, Giants, New, San Francisco, Derby, Philadelphia Phillies, Orioles, Minnesota, The Orioles, Baltimore, Reds, Padres, Cincinnati, San Diego, Brewers, Pirates, Milwaukee, Pittsburgh, Braves, Marlins, Orlando, Atlanta, Miami, The Braves, Nationals, Phillies, Philadelphia, Royals, Dodgers, Kansas City drubbed, The Dodgers, Cardinals, Yankees, New York, Astros, Rangers, Houston, Texas, Diamondbacks, Arizona, Mariners, Rays, Seattle, Tampa Bay, White Sox, Athletics, Oakland, Angels, Tigers, Rockies, Detroit, Colorado, Thomson
Locations:
New York, San, Baltimore, Minnesota's, Washington, J.T, Kansas, Kansas City drubbed Los Angeles, Angeles, Montgomery, Texas, Arlington , Texas, Los Angeles, Anaheim , Calif, California, Anaheim, Denver