Here is what I get for win percent in second start for groups of debut winners by distance:
Code:
Debut Win Dist next race win pct
1 1/16 MILES 15.09%
1 MILE 17.14%
5 1/2 FURLONGS 15.74%
5 FURLONGS 16.97%
6 1/2 FURLONGS 17.97%
6 FURLONGS 18.85%
7 FURLONGS 15.76%
First time winners seem to do well in general but 7 furlong winners are not apparently better than others.