Sweeney, 24, signed for $100,000 as a 13th-round pick out of Central Florida in 2012. He has raised his prospect profile by producing throughout his pro career, including leading the high Class A California League with 16 triples in 2013. Sweeney also led the Double-A Southern League with 88 runs and 77 walks in 2014. He was hitting .271/.332/.409 with nine homers and a Triple-A Pacific Coast League-high 32 steals in 116 games this season.
Though he's ranked No. 8 on MLBPipeline.com's Top 10 Second Base Prospects list, Sweeney has spent more time in the outfield in 2015.