Panatta was a fantastic clay court player but he didn't beat Borg again after Borg reached his best years starting in 1977. He took Borg to five sets in 1978 in the Italian Open final which was one of the most bias matches I have ever seen in terms of lines calls. The linescalling was to be nice unbelievable. Borg also had objects tossed at him but somehow won the match. Maybe Stan Smith overcame more in his Davis Cup match against Tiriac but I'm not sure. Pecci was another player who was fantastic when he was on his game. Borg actually led in the third set of that French Open final they play I believe by 5-2. Just one more game to win in straights but Pecci played three great games to tie and eventually win the set.