No. 3 Stanford baseball (41-14, 21-9 Pac-12) defeated No. 4 Oregon State (44-15, 20-10 Pac-12) 9-5 to win the inaugural Pac-12 Baseball Tournament on Sunday. The win extends Stanford’s winning streak to 16 games, which is the second-longest active winning streak in college baseball. On Sunday evening, Stanford got off to a hot start against the Beavers. Junior DH Brett Barrera, the Pac-12 leader…