ATLANTA — Atlanta Braves first-round draft pick Lucas Sims has signed a contract and is expected to join their Gulf Coast League affiliate Tuesday. Sims, a right-hander from Brookwood High School in Snellville, led his team to the state championship game this year and was taken with the 21st overall pick this week. He had committed to pitch at Clemson, but signed Thursday with the Braves and received a signing bonus of $1.65 million.