INDIANAPOLIS (AP) — Gonzaga’s defense has been an overlooked part of the team’s run to an NCAA Tournament regional final. The Zags remain unbeaten entering Tuesday’s matchup with Southern California for a trip to the Final Four. They rank seventh nationally in Ken Pom’s adjusted defensive efficiency rankings by allowing 88.6 points per 100 possessions. Gonzaga is the No. 1 overall seed in the NCAA Tournament. Sixth-seeded USC is back in a regional final for the first time in 20 years. The Trojans are coming off wins against Drake, Kansas and Oregon to reach the Elite Eight.