Who is 2021 MLB draft's No. 1 pitching prospect? Scouting Vanderbilt's Jack Leiter and Kumar Rocker

Joe Howell/Vanderbilt University Athletics via AP

In last week's early 2021 MLB draft rankings, Vanderbilt right-handers Jack Leiter and Kumar Rocker were second and third, respectively, on the list -- and the top two pitching prospects on our board.

I had a chance to see the two pitch back-to-back in both ends of a doubleheader on Sunday in Nashville against Georgia State, so here's a deep dive on both prospects and what could cause their stock to rise (or fall) heading into the 2021 MLB draft starting July 11 in Atlanta.