LUBBOCK, Texas — Backup quarterback Steven Sheffield threw for 238 yards and three touchdowns to help lead Texas Tech to a 48-28 win over New Mexico on Saturday.

Taylor Potts, the nation's leading passer, left the game before halftime after two hard sacks appeared to affect his balance. Officials from Texas Tech (3-2) declined to comment on his injury.

Sheffield threw scoring passes of 25, 20 and 62 yards. He was 16 of 23 with one interception. Alex Torres, Edward Britton and Harrison Jeffers caught the touchdowns.

Potts was intercepted twice, both by cornerback Nathan Enriquez.

The Lobos (0-5) got their only first-half score off Potts' second interception. Donovan Porterie threw a 7-yard TD pass to Josh Fussell in the second quarter.