RTTS In-game Sinker Velocity Problem

[The Liberater_XBL]

Anyone else not able to advance your sinker velocity in RTTS? I have it as my primary pitch and can only increase its break attribute in-game, even on late swing Ks. Seems like a pitch that’s labeled as “a type of fastball” by the game should be able to have its velocity go up. Having no problems with my 4-seam and Cutter

[Yardem Hane_XBL]

It should be a fastball, but it's not. The game considers the Sinker a breaking ball.
Here's how I know: there's an in-game challenge that you are sometimes presented with, "strike out the batter with a fastball". This succeeds with 4SFB, 2SFB, or Cutter, but fails with a Sinker.

The only way to increase the velocity of the Sinker (other than Archetype and Perks) is through weekly bullpen sessions.

[needmoresleep_MLBTS]

Yardem is correct. The split finger fastball is considered a breaker as well.