SAN DIEGO (AP) _ The San Diego Padres agreed to a contract with first-round draft pick Mark Phillips on Monday and promoted right-hander Brian Tollberg from Triple-A Las Vegas to start on Tuesday night at Arizona.

Phillips, an 18-year-old left-hander from Hanover, Pa., was the ninth pick overall in this month's amateur draft. He is expected to join Class A Idaho Falls of the Pioneer League next week.

Phillips will receive a signing bonus of $2.2 million, and the Padres will reimburse him for his college tuition. He had signed a letter of intent to play at LSU, which won the College World Series.

Tollberg, meanwhile, will become the fifth pitcher, and third starter, to make his major league debut for the Padres this season.

The Padres sent right-hander Rodrigo Lopez outright to Las Vegas. Lopez made his major league debut on April 29, and was 0-3 with an 8.76 ERA in six starts during two stints with the Padres.

The other Padres pitchers who made their big league debuts this year are starter Adam Eaton and relievers Kevin Walker and Brandon Kolb.

Tollberg, 27, was 6-0 with a 2.83 ERA in 13 Triple-A starts this season.