RALEIGH, N.C. — The way senior Jakob Gollon sees it, Mercer has been building toward this NCAA tournament through years of playing power conference teams. Each matchup — the lopsided losses, the confidence-building wins, even the final minutes of a close game — taught the 14th-seeded Bears a lesson. And that has helped them mature into the team that stands here now, fresh off the tournament's biggest upset over Duke and playing Tennessee to reach the round of 16 on Sunday in the Midwest Regional.