That clearly frustrated Stephens, who started making errors while trying to hit the ball even harder.
Forehands account for 75 percent of ground-stroke winners, and are the ultimate weapon in forcing opponents to hit errors - which is no small matter because errors account for about 70 percent of all points in tennis.
Djokovic holds by hitting forehands repeatedly cross court to Raonic's backhand until the Canadian makes an inevitable error, with a poor attempt to hit it down the line going wide.
Thiem started to get frustrated, to hit loose errors.
Two errors gifted Ferrer a chance to hit straight back and he did so in a punishing rally, before grabbing the set two games later when Nishikori netted a smash.
There were many marks to hit, many opportunities for error — but there was no time to worry about it.
It certainly wasn't the prettiest game of the season, the Pirates committing two errors and hitting a batter, which was two less batters than the Dodgers managed to hit.
ADS is used to assess general attention ability and its detailed evaluation index includes omission errors, commission errors, hit reaction time mean, hit reaction time standard deviation, attentiveness, and risk taking.
Tomic did hit 10 winners to Murray's seven for the match but the most eye-opening SAP statistic was the 32 unforced errors he hit to Murray's 13.
Likewise, there was greater activation for aware errors compared to hits in the left PCMA (t(13) = 3.1, p = .009), but not in the right hemisphere (right PCMA: t(13) = 0.25, p = .8).8
