Argentina's Gustavo Fernandez won a heavyweight showdown with Britain's Gordon Reid at the US Open Wheelchair Championships in St Louis, part of the sport's Super Series.
With only four seeded players in the draw it meant the possibility for some stand-out ties in the first round at the Dwight Davis Tennis Center.
Fernandez, the world number four, and Reid have both won Super Series titles this year and the pair are both Grand Slam winners.
The Argentinian came through this time, winning 7-5, 6-4 over fifth-ranked Reid to reach the quarter finals.
In other men's matches, Britain's world number two Alfie Hewett battled back to knock out France's Nicola Peifer 3-6, 6-4, 6-1.
Japan's Shingo Kunieda, the world number one, was awarded a bye.
In the women's draw there were home wins for Americans Emmy Kaiser and Mackenzie Soldan.
Kaiser beat South Korea's Ju-Youn Park 6-3, 6-7, 7-6 and will now meet Dutch world number one Diede de Groot in the last 16.
Soldan won an all-American contest against Joanne Nieh, 6-4, 6-1.
The quads tournament featured a win for South Korea's Kyu-Seung Kim over Canada's Rob Shaw.
Kim won 6-2, 6-2 to go through.
Former world number one Nick Taylor also advanced, with the American beating compatriot Steven Baxter 6-2, 6-2.
The last Super Series event of the season continues tomorrow.
It is preparation for the US Open, the final Grand Slam competition of the year.