MILWAUKEE -- Josh Willingham put the ball from his second grand slam, inscribed with all the details, into an acrylic cube. His bat was staying in circulation for now, even if the Hall of Fame asked for the lumber.
"No, no way," he said. "Well, when I break it, I'll give it to them."
"That's the beautiful thing about baseball," he said. "You come into the game before the game and you never know what could happen."
Willingham became the 13th player to hit two grand slams in a game and first since Boston's Bill Mueller hit one from each side of the plate on July 29, 2003, against Texas. Willingham's eight RBIs were the most in Nationals history and tied the franchise mark, accomplished last by Tim Wallach for Montreal against San Diego in 1990.
"It's something that when I was coming up to the plate the second time I knew that I had a chance to do it," Willingham said. "Obviously I wasn't thinking about doing it, I wasn't trying to do it. I was just trying to get a good pitch to hit and hit it hard."
Willingham hit his 15th homer off Jeff Suppan (5-8) with two out in the fifth, capping a six-run inning with a 400-foot drive to left-center that struck the facing of the second deck. He connected again in the sixth, finishing a seven-run rally with a one-out shot off Mark DiFelice that hit the fencing above the Brewers' bullpen and dropped in to make it 13-5.
"Everything's got to be lined up right for you. You've got to be seeing the ball good, hitting the ball good and your teammates have to have been on base for you all night -- twice," Washington interim manager Jim Riggleman said.
Willingham said he realized the significance of his milestone as soon as he knew his second shot was gone.
"I didn't know that 13 was the number, but I knew it was a rare feat and I was thinking about it," he said.
Willingham, who also doubled in the second, finished 3 for 5 and Ryan Zimmerman hit a solo homer in the eighth for the Nationals, who have won three straight to raise their major league-worst record to 31-68.
Willingham was due up fourth in the order when Zimmerman hit his homer.
"I told Zimmerman, I was like, 'Well, get on for me so I have a chance to hit with the bases loaded again.' Then he hits a home run and I said, 'Why'd you do that?'" Willingham joked.
With series against the Nationals and San Diego, this was supposed to be the point of the schedule where the Brewers made up some much needed ground. Milwaukee is actively looking to trade for a starting pitcher before Friday's deadline, but it may not matter much. The Brewers have allowed nine homers in the last four games.
Corey Hart hit his second homer in as many days and Ryan Braun added a two-run shot but the Brewers (49-50) fell below .500 for the first time since April 27. They are 7-15 since entering July with a two-game lead in the NL Central.
"The fans are getting a little restless and I don't blame them," Brewers manager Ken Macha said. "We can't continue to have to get four innings from the bullpen every night."
Willingham's homers overshadowed a less-than-stellar start by Stammen. The rookie right-hander trailed 2-0 before Willingham put him ahead 6-2 after Suppan allowed an RBI single to Nyjer Morgan and walked Adam Dunn with the bases loaded earlier in the fifth.
Milwaukee cut it to 6-5 on Felipe Lopez's RBI single and Braun's 20th homer, chasing Stammen with two outs in the fifth.
Suppan allowed 10 runs and 10 hits in 5 1/3 innings.
Willingham has four career grand slams. His first two were in 2007 with the Marlins. ... The Nationals can match their season-best winning streak with a victory Tuesday.
Sources: Miami Marlins acquire Joey Wendle, send Kameron Misner to Tampa Bay Rays
The Marlins have acquired third baseman Joey Wendle from the Rays for prospect Kameron Misner, sources told ESPN.
Chicago White Sox, valued veteran Leury Garcia agree to terms on new contract, baseball source says
Seeking a return to the MLB postseason, the Chicago White Sox brought back Leury Garcia, 30, the popular, longest tenured player on the team, on a new deal Tuesday, a source told ESPN's Jesse Rogers.
MLB free-agency tracker: Latest moves, grades and analysis
Need to keep tabs on all the major signings? Want to know how our experts grade the big deals? We've got you covered.
Source: Pirates, catcher Roberto Pérez agree on 1-year deal
The Pittsburgh Pirates have agreed to a one-year deal with free-agent catcher Roberto Perez, a source tells ESPN.
MLB free-agency grades: Was Javier Baez the right choice for the Detroit Tigers?
Baez makes the rebuilding Tigers a lot better -- and more exciting. But Carlos Correa might have been the better fit.
Sources: Chicago Cubs agree to deals with Yan Gomes, Clint Frazier
The Cubs and catcher Yan Gomes have agreed to a two-year, $13 million contract, sources told ESPN's Jeff Passan. The team and Clint Frazier also have agreed to a deal, per ESPN's Jesse Rogers.