Eaton, from Bend, Ore., garnered 4,069 points, 39 better than Rickey Moody of Washington State, who scored 4,030 points.
Eaton won the 100 meters in a time of 10.57 -- the best legal time of his career, which was also just .02 off an NCAA regional qualifying time in the event. He also took first in the high jump, sharing the best clearance of 6-6 with Moody and Josh Hustedt of Stanford, as well as the 400 meters, where his winning time was 47.68.
Eaton was second in the shot put with a PR throw of 40-2.25 and took fourth in the long jump (22-5.75).
Junior Alexey Shkuratov, competing in his first multi-event of the season, boosted Oregon's decathlon hopes with a fourth-place showing after day one.
Shkuratov was fourth in the shot put (38-11.75), high jump (6-3.5) and 400 meters (51.66), and fifth in the other two events for first day total of 3,616 points. UO sophomore Marshall Ackley was also in the running to score points for the Ducks, standing sixth after Friday with 3,500 points.
On the women's side, freshman Brianne Theisen stood third after four events in the Pac-10 championships heptathlon with 3,369 points. She set a PR in he 100 meter hurdles, finishing sixth in 14.21. She also had a PR in the shot put, throwing 38-3.25 to take fourth. Theisen matched her career best in the high jump with a clearance of 5-8.75, which tied for third.
UO junior Kalindra McFadden was 10th with 3,029 points, while sophomore Erin Funkhouser was 19th at 2,629.
Arizona State's Jacquelyn Johnson led the heptathlon with 3,691 points, followed by Ali Nia of USC at 3,606.
Eaton First Day Leader at Pac-10 Decathlon
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