Quarterback Marcus Mariota insists his left knee isn't a concern and that he'll be ready to go Saturday when No. 6 Oregon hosts Utah.

There are lingering questions about how much the mysterious knee injury contributed to the Ducks' 26-20 loss at Stanford last Thursday. Oregon doesn't discuss injuries, and the sophomore quarterback hasn't been specific about what's going on.

Asked this week whether his knee is an issue, Mariota replied: "Not at all." Pressed whether he is 100 percent, he said: "That's something that I can't tell you."

Mariota has passed for 22 touchdowns and run for nine this season. He has gone 327 attempts without an interception.

"My knee is what it is. I'm not going to use that as an excuse," he said Tuesday.

Mariota is believed to have injured his knee in the Ducks' 42-14 victory over UCLA, and he played the second half with a brace. He wore a brace throughout the game at Stanford and has worn it in practice this week.

Soccer

Mexico has a last chance to reach next year's World Cup in Brazil. El Tri, which last missed a World Cup in 1990, opens a two-game playoff Wednesday against New Zealand, with the winner earning a World Cup berth.

Mexico should be the overwhelming favorite, particularly in the first match at Azteca and the game played at an altitude of 7,350 feet.

The second leg is next week in Wellington, New Zealand.

Golf


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Stacy Lewis shot 7-under 65 to lead the LPGA Tour team to the championship of the 3Tour Challenge in Henderson, Nev. The LPGA Tour edged the Champions Tour by one stroke and beat the PGA Tour by nine strokes.

Natalie Gulbis was 2 under for the LPGA Tour. Cristie Kerr didn't have her score count on five holes in this two-player, best-ball format that allowed each team to discard one score per hole.

Kenny Perry missed a 7-foot birdie putt on the par-4 18th hole that would have sent the match into a playoff. Perry and Bernhard Langer didn't score on all 18 holes for the Champions Tour, which was led by Fred Funk at 4 under.

Billy Horschel paced the PGA Tour team, which also included Boo Weekley and Jason Day, at even-par 72 The PGA went 5 over on the par-4 18th hole, where Horschel had a quadruple-bogey and Weekley bogeyed.