Guillen, the former Angels' outfielder, tied it at 3-3 in the eighth with a two-run homer off Scot Shields (5-4), then Junior Spivey's RBI single and Brian Schneider's sacrifice fly gave Washington a two-run lead.
The game was delayed some 10 minutes in the seventh inning when Donnelly's glove was examined by all four umpires and he was tossed. Angels manager Mike Scioscia then confronted Nationals manager Frank Robinson, who had asked the umpires to examine Donnelly's glove.
Both benches emptied as several players were pushing and shoving each other.
Washington players had to restrain Guillen. The Angels traded him in November.
Gary Majewski (2-0) pitched 1 1-3 scoreless innings, and Chad Cordero pitched the ninth for his 20th save in 22 chances.
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