Alcaraz and Sabalenka question the tennis calendar, while Roger Rasheed pushes back on complaints.
Alcaraz is through the US Open first week in control, and now faces Tommy Paul next.
Alcaraz and Paul bring contrasting form and a familiar rivalry into their US Open fourth-round clash.
Alcaraz beat Wu Yibing in straight sets and reached the US Open last 16 in style.
Alcaraz says he will take longer breaks in future, even with ATP calendar and bonus-pool costs.
Navratilova backed Alcaraz’s concerns, saying 12-day Masters events are “horrible for the top players”.
Sinner’s first message since his US Open withdrawal reflects a growing injury debate.
McEnroe says Alcaraz is his favourite player and believes more majors could follow for the Spaniard.
Alcaraz advances at the US Open and Medvedev says the Spaniard is the top favourite.
Williams and Kenin made history, but the US Open late start prompted criticism.
