Calling foot faults is tough at the amateur level. First of all, it’s difficult to see completely clearly that an opponent is certainly foot-faulting. In doubles, it’s slightly easier to watch for, but still difficult to call.

Other than foot-faulting, the number one rule problem in amateur/recreational tennis is line-calling. Of course there will always be bad line calls on purpose and otherwise, but there’s an even more fundamental problem among tennis players (mostly at the 3.0-3.5 level). They just don’t get that if the ball touches the line, it’s good.

The USTA, the ATP and the Sony Ericsson WTA Tour ATP announced in 2006 that electronic line calling technology, along with a player challenge system, will become part of professional tennis in North America.