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But Belize, a team made up of a mix of amateur and professional players, lost steam after the goal, coach Andrew Mork said.
"It didn't last long enough," Mork said. "And that really turned the game around for us."
Wondolowski added a third goal in the 40th minute.
The United States took a 4-1 lead in the 58th minute when Stuart Holden scored with an assist from Donovan, giving him 50 for his career.
Donovan got another when he passed to Michael Orozco for a header in the 72nd minute to make it 5-0. He got a goal — the 52nd of his career — with a penalty kick in the 76th minute.
"The crowd was great, the energy was great, I thought we started really well," Donovan said. "A little disappointed to give up a goal, but I think it was a great night for us, a great night for the fans and a good start for the tournament."
After the round-robin phase, the winners and runners up from each group, and the two top third-place finishers, advance to the knockout round. The Gold Cup tournament concludes July 28 at Soldier Field in Chicago.
It was the first visit to Portland for the U.S. men's team since 1998. Attendance was announced at 18,724.
NOTES: Holden's goal was his third for the national team and first since the 2009 Gold Cup, before the Netherlands' Nigel de Jong broke Holden's right leg in March 2010 and Manchester United's Jonny Evans tore ligaments in Holden's left knee in March 2011, an injury that limited him to one match in the following 22 months. ... Brek Shea entered in the 61st minute. Originally scheduled to report to Stoke after the Guatemala match, he was added to the Gold Cup roster after Josh Gatt injured a knee playing for Norway's Molde.
|Tampa Bay - LP: J. Odorizzi||2||FINAL|
|Boston - WP: J. Lester||6|
|LA Angels||8||Bottom 9th Inning|
|Oakland||8||Bottom 9th Inning|
|Houston||2||Top 5th Inning|
|Denver||8||1st Qtr 6:45|
|Pittsburgh||2||1st Prd 13:37|
|Los Angeles||8:00 PM|
|NY Islanders||9:00 PM|
|MD-Eastern Shore||26||2nd Half|
|William & Mary||18||1st Half 13:00|
|Manhattan||11||1st Half 13:43|
|Kent State||8||1st Half 13:44|
|Ball State||4||1st Half 14:14|
|Denver||6||1st Half 12:45|
|North Dakota St||16|
|Central Mich||6:30 PM|
|Bowling Green||7:00 PM|
|St Marys-CA||8:00 PM|
|SC State||8:00 PM|
|Western Carolina||8:00 PM|
|South Dakota St||8:30 PM|
|San Francisco||10:00 PM|
|South Dakota St||58|
|Northern Ill||80||1st OT 0:01|
|Pacific||53||2nd Half 2:01|
|American Univ||6:00 PM|
|(3) Louisville||8||1st Half 14:00|
|Marquette||14||1st Half 12:36|
|Kent State||2||1st Half 15:16|
|Ohio U||0||1st Half 14:43|
|Holy Cross||16||1st Half 11:13|
|San Jose St||6:30 PM|
|(5) West Virginia||8:00 PM|
|Air Force||9:00 PM|
|San Diego State|