Re: Was there ever a biological biped that could handle Data in a figh
He's definately stronger than any biological being meaning he could defeat humans, klingons, vulcans (even if they are three times stronger than humans!) etc...
The only thing that would pose a threat to him physcially would be another machine and I think he'd have equal strength to another android such as Lore or his daughter Lal.
As others have pointed out, the only way he's been physically defeated is through strategy such as grabbing his leg from behind, that's not to do with strength.
I do think that TNG could have made more use of Data's strength though, there were plently of episodes where i wondered why he didn't just use his superhuman speed and strength to get out of a situation! Maybe his ethical programme had something to do with it though and also the scriptwriters wanting to make his strenth and abilities seem more mysterious like they did with Spock (hence the vulcan nerve pinch instead of knocking somebody out with brute force).
Also because Data was portrayed as rather naive and innocent so to have him always beating the crap out of people would have made him seem too macho and sadistic. I'm not saying he's "gay" though as people are fond of claiming.....he's more attractive as he is actually, I prefer mysterious stength. But that's just my opinion =D