Originally Posted by timnz
Connors beat Borg a couple of times on clay in South America in minor tournaments though in 1977 and 1978. One of them was in Buenos Aires in 1978 straight after the US Open - he beat Borg 5–7 6–3 6–3. He also Beat Borg on clay in 1974 in Indianapolis. Having said that from 1977 onwards Borg was definitely dominant over Connors.
I think in a thread last year somebody questioned whether the Buenos Aires exo really was on clay. It was something about whether the exo was held at the venue normally used for Davis Cup (definitely red clay) or on some other court.