Anna Kalinskaya dug deep. The Russian, two points from defeat in the third set against pal Anastasia Potapova, rallied from 4-1 down to win an improbably match tiebreak to punch her ticket into the quarterfinals of the French Open on Monday, taking a 6-4, 2-6, 7-6(7) win. “I’m shocked, I can’t believe the match is over and I’m standing here doing an interview now,” Kalinskaya, the No. 22 seed, said. “What a match – unbelievable fight from both of us until the last second. “I’ve played against