I think it is baseball because of how many players are in it.
According to Lahman it would from 1871 to 2008 it would be 17,264 having played pro baseball
a few hundred (not including minor league baseball)
Semour Nipps
yes
I have no idea who Melissa Milano is and I for sure do not care how many pro athletes she has been with. It it really no one's business but hers.
18 position players, 1 bench coach 19 total
about 67%
20.5 million dollars
ichiro suzuki
There is no education requirements for MLB players.
Unfortunately, I think Japan, Cuba, and the Dominican Republic are the strongest baseball countries in the world. MLB has the best players but many of them come from these other countries. The three aforementioned countries bleed baseball while the USA has so many major pro sports that baseball gets lost in the shuffle.