This pretty much covers it. These factors also radically transformed how the game is actually played, too. Mostly gone are the defensive counter-attackers like

This pretty much covers it. These factors also radically transformed how the game is actually played, too. Mostly gone are the defensive counter-attackers like Michael Chang due to incredible pace that ground strokes are hit; winners are routinely hit from beyond the baseline. Such a concept was rare just 20 years ago when Chang was world rank 2. For some beautiful writing on the subject, the ever eloquent David Foster Wallace is someone to look up.