The Mizerak-Sigel rivalry was during the straight poor era, mostly from 1979-85. The rivalry was pretty even when it came to straight pool, but Miz was no match for Mike in nine ball.
Sigel was a thorn in Efren's side in the mid and late eighties. The two met in many tournament finals, and Sigel dominated him.
Sigel had an edge over Earl, though not a big one, in their many head to head nine ball matches form 1984-93, but Earl was beginnning to get the better of him in the latter part of that period. Ask Earl Strickland who the best nine ball player he's ever seen and he'll say Mike Sigel. He's said so on numerous occasions.
Earl vs Efren was a great rivalry. Aside form Efren's great win at the Sands Regency when he two rail kicked in the five double hill, Efren's great achievement against Earl is surely the race to 120 they played in Asia in either 1998 or 1999. Efren came from well behind to win 120-117. Still, Earl had the better of this rivalry over the years.