My worst beat-down was at last year's SBE Open/Pro 10-ball, when I was suffering a pretty serious sinus infection. I took a 10-2 drubbing by Ralf Souquet, and then a 10-0 sweep by Joey Testa. I just couldn't get out even when the rack was handed to me. Although pretty mad at myself for days after (for having my absolute worst showing ever at this event), I gradually accepted the fact I did the best I could during a time when my mental acuity was at its worst.
It's hard to remember "a best beat-up" because although one can get caught up "feeling good," I don't like to remember those things.
(I just march on, because the one day you think you're superman, someone with kryptonite will come along and totally debilitate you.) The most recently memorable, though, was when I was visiting my folks in Denver, CO during Christmas 2009, and I ventured into a well-known regional league stronghold, Greenfields, on New Year's Eve. I had intended only to grab a pint or two of Guinness to ring-in the New Year, but as I walked in, standing room only, they were announcing last call entry for their year-end Open 9-ball event. I didn't have my cues with me (I don't like to travel with them -- too much of a PITA), so I figured, "what the hey?" I pulled a cue off the wall, and entered my $20. I was the last/64th player to enter. It was short races to 5. However, in the spirit of having fun and not giving a damn, I was handing out 3-packs and 5 - 0 sweeps on those barboxes.
(I'm still amazed at how my opponents would try to play safe, thinking if they pin the cue ball against the cushion with [most oftentimes] an unobstructed view at the object ball on these barboxes, that it's somehow a "safety.") It was double-elimination, but I blistered through and pocketed 1st place. What made it memorable, were the mumblings I overheard that an out-of-town Guinness-drinking New Yawka came in and stormed their stomping ground!
-Sean