Jewishsports.com's "Jews in the NBA" page turns up 20 names--19 of which are owners (Mark Cuban, Bruce Ratner, and Wisconsin senator Herb Kohl), coaches (Larry Brown), GMs, or the NBA Commissioner. David Bluthenthal, a biracial forward on the Sacramento Kings, is 9 guys short of a league minyan--and he's never played a regular-season game.
In the NFL, Jewish players outnumber managers and owners, though only if you count inactive players. There are three quarterbacks among them--Sage Rosenfels (Dolphins), Gus Ornstein (Jets), and Jay Fiedler (QB)--and from their names I'd guess fans don't have trouble figuring out that they enjoy the occasional glass of Manischewitz.
As for baseball, though we may never have another Hank Greenberg, Sandy Koufax, or Al "Flip" Rosen, we do have Shawn Green, outfielder for the Diamondbacks but more properly belonging to his last team, the LA Dodgers, who is genuinely awesome. He has topped .800 in OPS (on-base percentage plus slugging percentage, the most useful measure of offensive quality you can find in newspaper statistics) in 10 of his 11 full seasons, and hit .297 with 125 RBIs and 49 homers at the height of his career, all while having the build of the scrawny beach victim in the old Charles Atlas ads.
The Red Sox have two Jews, both popular. Gabe Kapler, the wandering Jew of baseball (or the Grover Cleveland--he has returned to teams he once played for three times) returned after a lousy season in Japan, but then he ran the bases a little too enthusiastically in September and popped his achilles tendon. But Kevin Youkilis, the living embodiment of sabermetrics (Billy Beane called him "the Greek god of walks" though he is actually Romanian) and every Boston fan's favorite unsung hero, might get a chance to play first base most of next season now that we have an infield deficit.
(The newly signed Red Sock Coco Crisp at least sounds like the invention of a Jewish marketer. Now if we can just keep J.T. Snow off first, fire the base coaches, and get a shortstop with a batting average above .250--no offense to Alex Cora--we'll be in business.)
There are also seven Jewish pitchers. Matt Ford, of the Brewers (itself a Jewish-sounding team name), is from Plantation, Florida, where my grandfather and many other old Jews live. Jason Marquis, a switch pitcher on the Cardinals, is pretty good; his lifetime ERA is 4.15, which isn't great, but he is one of the best-hitting pitchers in the game, with an amazing .302 batting average, 1 HR and 19 RBIs over the last two years (much better than the average MLB batter when you consider he only had about 1/5 the at bats). The Blue Jays' Scott Schoeneweis is also decent (especially since he switched from starter to setup).
It appears that in baseball and football both, Jews are heavily weighted towards the more cerebral, less physical roles.