Zac Thomas had a successful return to his home state on Saturday, scoring a touchdown and leading No. 21 Appalachian State to a 30-3 victory over South Alabama.

The junior quarterback, the reigning Sun Belt Conference Player of the Year, passed for 132 yards, including a 19-yard TD to Thomas Hennigan, without a turnover. The Hewitt-Trussville High School graduate has led the Mountaineers to 13 consecutive victories, which trailed only Clemson and Ohio State entering the game.

Appalachian State (7-0, 4-0 Sun Belt) put on an overwhelming defensive performance at rain-soaked Ladd-Pebbles Stadium. When the Mountaineers took a 23-0 lead with 3:45 left in the third quarter, South Alabama had not run a play beyond midfield and had gained only 43 yards and one first down on 32 offensive snaps.

The Jaguars (1-7, 0-4) were held to a season-low 139 total yards. The previous low was 190 in a loss to UAB. South Alabama avoided the first home shutout in school history with a 37-yard field goal with 5:43 remaining.

SHORT FIELD SUCCESS
The Mountaineers didn’t produce many explosive offensive plays, but they didn’t need to. Because the defense was so suffocating, their five scoring drives covered only 44, 12, 34, 62, 49 and 69 yards.

THE TAKEAWAY
Appalachian State: The No. 21 ranking has the Mountaineers just behind No. 16 SMU and No. 18 Cincinnati and just ahead of No. 22 Boise State among Group of Five teams. Appalachian State is the first Sun Belt Conference team to be ranked in consecutive weeks.

South Alabama: The Jaguars produced no offense until turning to backup quarterback Desmond Trotter midway through the third quarter. The redshirt freshman from Birmingham provided a spark by leading USA to a 65-yard drive that ended in a 32-yard field goal attempt by Frankie Onate that was blocked. He then led the fourth-quarter field goal drive.

POLL IMPLICATIONS
Appalachian State should at least maintain its national ranking after Saturday’s defensive showing.

UP NEXT
Appalachian State visits Georgia Southern, which knocked the Mountaineers from the rankings last season, on Thursday night. The Panthers beat the Mountaineers a year ago this week. The Mountaineers haven’t lost since.

South Alabama visits Texas State on Nov. 9 after an open date.