Billy Steele
If the game is pool then the player is Efren Reyes..
I'd have to go with Efren, too.
But I like that a few are naming the not-so-famous names.
Back in the early '70s, I met a kid named Billy Steele.
At 6-foot, 145 pounds, he wasn't physically impressive. Long pony tail, and a wispy little goatee that took him several years to grow!
Quiet and humble, he didn't hustle, but would play anybody. He never owned a car, and besides shoes and underwear, bought all his clothes at the Salvation Army store. Quit drinking BEFORE he came of age and never smoked a cigarette. He was a lefty, but could play pretty well from the other side, too. And I never saw him lose his temper or even raise his voice...
He always gave me credit as one of his teachers, though all I taught him was a bit about safety play. Like me, he began playing on the 9-footers, but became a bar box monster. His fame was limited to the upper midwest, though he did travel a bit, once with me to Florida and many times to Vegas, where he was a legend at national amateur events. He never won an national amateur singles title, but he didn't much like singles tournaments. One of our teammates, a four-time national champion wanted no part of him for the $.
Nobody I ever met who saw Billy play really "wanted" to play him. I saw him lose only once gambling. He was playing a pretty strong player from Minnesota for $100 a rack. The guy ran five racks and Billy was out of bullets, but I believe he won that and more back from the guy at a later date.
On a road trip to Vegas, he took off a well-known gambler for $19,000 on the guys home table!
In our home town it was generally accepted that the ONLY way to beat him was to break and run every rack. Billy was however, unable to beat an infected ulcer, and was gone far too young.