Fils won their quarterfinal in Tokyo a month ago, but Shelton's run this week has guaranteed the American's return to the Top 20.

The big-serving American has come to life indoors, scoring his second Top 10 win in the last two months to reach the final four at the Swiss Indoors Basel.

The American continued a solid fall swing with a run to the quarterfinals of Swiss Indors Basel, booking a last-eight encounter with Andrey Rublev.

The 39-year-old home favorite became the oldest match-winner in tournament history on Wednesday.

The Antwerp champion won a sixth straight match and kept Ruud from strengthening his Turn bid at the Swiss Indoors Basel on Wednesday.

Rune and Tsitsipas kept alive their slim hopes of reaching the ATP Finals with first-round wins at the ATP 500 event.

The top seed is eighth in the race for the ATP Finals, trying to stay ahead of ninth-placed Alex de Minaur, who is playing in Vienna.

Daniil Medvedev began his Erste Bank Open title defense in style Wednesday, too.

A pair of physical issues have forced the 20-year-old to forgo next week's ATP 500 event.

The Canadian is seeking a third straight title—after wins in Florence, Italy and Antwerp, Belgium this month—and has not faced a break point in three matches at Basel.

Roberto Bautista Agut, a routine winner over Andy Murray, awaits the home favorite Friday.