Several players, including two Team World stars, are stepping up as the season winds down.

While a world apart, the Czech teenagers scored a unique feat.

The Brit's entrance comes as a surprise after previously indicating he would forgo clay in favor of training for the grass-court swing.

A contrast in styles highlights the Collins-Jabeur early-bird special, while Tommy Paul aims to topple good friend Taylor Fritz on Monday in Miami.

The 16-year-old Czech became the youngest to reach the fourth round in Miami since 2004 after former champ Azarenka made an abrupt exit.