Zimmerman, 32, missed significant time due to injury from 2014-16, and in 115 games last season, hit .218/.272/.370 with 15 home runs and 46 RBIs. At his current pace, Zimmerman could eclipse his home run and RBI totals from last season before the month is out.
• Cast your Esurance All-Star ballot for Zimmerman and other #ASGWorthy players
Zimmerman's career high for homers is 33 in 2009 (his only All-Star season to this point), and in his last full season -- 2013 -- he hit 26. He didn't hit his 12th homer of the season in 2016 until July 6.
"Keep 'em coming," said Nationals manager Dusty Baker of Zimmerman's power surge after Washington's 4-2 win.
If they keep coming, Zimmerman could be looking at a career year, not to mention a trip to Miami with his second All-Star selection.
Manny Randhawa is a reporter for MLB.com. Follow him on Twitter at @MannyOnMLB. This story was not subject to the approval of Major League Baseball or its clubs.