Great observation! Although there's always a nit to pick: Khan boasts on five times Kirk's strength, while Vulcans are credited with just three times Sisko's strength in the DS9 baseball holodeck romp. (Or is it just that Sisko is so much stronger than Kirk?)
That Spock outsmarts Khan is a bit unfair, too, as Spock bests the Augment in his own game only in those adventures where Khan has already lost his cool. Defeating the stark raving mad character of ST2:TWoK is more Khan's own doing than Spock's, and the stark non-raving mad character of ST:ID is additionally being pelted by hits from his other opponent, the satanic Marcus.
Timo Saloniemi