Morgan put the U.S. in front for the first time in the third minute of injury time at Old Trafford. Megan Rapinoe scored in the 54th and 70th minutes, and Abby Wambach in the 80th on a penalty for the U.S.
Morgan's 6-yard header, on a long cross from Heather O'Reilly, went high into the net over goalkeeper Erin McLeod for the winning score.
The Americans overcame a hat trick from Christine Sinclair, who scored in the 22nd, 67th and 73rd minutes for Canada.
In men's basketball, Kevin Durant helped the U.S. team put away Argentina with one impressive shooting burst. Durant scored 17 of his 28 points during the Americans' 42-point third quarter, turning a one-point game into a blowout that sent the U.S. soaring into the quarterfinals with a 126-97 victory over Argentina.
Jenn Suhr has been America's best female pole vaulter for a while. Now she's the best in the world. Suhr rounded out her resume with Olympic gold, vaulting 15 feet, 7 inches to defeat Cuba's Yarisley Silva, who cleared the same height but lost on a tiebreaker because she had one more miss in the competition.
SAN DIEGO (AP) - A group headed by former Los Angeles Dodgers owner Peter O'Malley and including pro golfer Phil Mickelson reached agreement to buy the San Diego Padres from John Moores. The purchase price is believed to be around $800 million.
O'Malley is the son of Walter O'Malley, who bought the Brooklyn Dodgers in 1950 and moved them to Los Angeles before the 1958 season.
Major League Baseball owners must approve the agreement. They are scheduled to meet later this month.
RENTON, Wash. (AP) - Terrell Owens is coming back to the NFL, hoping the Seattle Seahawks' search for another veteran wide receiver will get him off the sidelines.
The 38-year-old Owens had a tryout with the Seahawks in the morning, and hours later the team announced it had agreed to terms with the former star receiver. He hasn't played in the NFL since the 2010 season with Cincinnati, when he caught 72 passes for 983 yards and nine touchdowns.
Owens sat out the entire 2011 season following surgery on his left knee and failed to receive any offers. He then had surgery on his left knee and didn't receive any offers to play last season.
ENGLEWOOD, Colo. (AP) - The Denver Broncos signed veteran free agent linebacker Keith Brooking. The 15th-year pro played his last three seasons in Dallas after an outstanding 11-year run in Atlanta, where he was the Falcons' No. 1 draft pick in 1998.
A five-time Pro Bowler, the 36-year-old Brooking has played in all 16 regular season games for 11 consecutive years, starting all of them in nine of those seasons. But he started just three games last year, when he was supplanted by Sean Lee.
Brooking recorded 34 tackles in 2011, his lowest total since 21 his rookie season after the Falcons made him the 12th overall pick out of Georgia Tech.
STATE COLLEGE, Pa. (AP) - A Penn State trustee cited a need for due process in telling the NCAA that he intends to appeal college sports governing body's strict sanctions on the university for the Jerry Sandusky child sex abuse scandal.
Trustee Ryan McCombie said in a letter to fellow board members that he planned to take the action and sought an NCAA hearing. He invited other trustees to join in the appeal. McCombie's lawyers later sent the NCAA their intent to appeal letter, saying they also represented other trustees.
The landmark penalties handed down last month included a four-bowl ban, scholarship cuts and 111 vacated wins from 1998-2011, meaning Joe Paterno no longer has the most coaching victories in major college football. Sandusky is awaiting sentencing in jail after being convicted in June on 45 criminal counts.
SACRAMENTO, Calif. (AP) - The Sacramento Kings extended coach Keith Smart's contract through the 2013-14 season. Smart's deal had been set to expire after the upcoming season.
The 47-year-old Smart took over for the fired Paul Westphal in January after a 2-5 start. The Kings went 20-39 the rest of the way under Smart during the lockout-shortened season.
LONG POND, Pa. (AP) - One day after a lightning strike killed a 41-year-old NASCAR fan at Pocono Raceway, officials said they warned fans to take cover when the weather turned nasty - even as stock cars continued to race around the track - while some fans insisted there was no warning.
Others took to Twitter and Facebook to say the announcements in the grandstands and camping areas to seek refuge in their cars came too late, after the worst of rain hit the track.
Ryan Zimmerman, of nearby Moosic, died as he stood near his car with the back hatch open in the raceway parking, according to the Monroe County coroner. Nine others were injured.