Rivera got just 19 at-bats at Miami as a freshman in 2014, then hit a combined .390 in one season at Chipola (Fla.) JC and two at NCAA Division II Tampa. He didn't get drafted until after his senior season, signing for $1,000 as a 28th-rounder in 2017. In his first full pro season, he was leading the low Class A South Atlantic League in hitting (.346) and on-base percentage (.395) when he got promoted in late June.
Rivera has one of the best right-handed swings in the White Sox system, possesses nice feel for the barrel and makes consistent contact. Though his stroke is geared more for line drives, he has solid bat speed and enough strength for some pull-side power. He's so aggressive and puts the bat on the ball so easily that he rarely walks, so there's some concern that more advanced pitchers will exploit his impatience.
A decent athlete, Rivera has a high baseball IQ that helps him get the most out of his tools. He's an average runner who will steal or take an extra base when the opportunity presents itself. His fringy arm and average range fit better at second base, where he played in the Arizona Fall League, than they do at shortstop, but he makes plays at the latter position because he reads balls well and has a good internal clock.
SS Laz Rivera assigned to Birmingham Barons from Winston-Salem Dash.
2B Laz Rivera assigned to Chicago White Sox.
SS Laz Rivera assigned to Winston-Salem Dash from Kannapolis Intimidators.
SS Laz Rivera assigned to Kannapolis Intimidators from AZL White Sox.