Despite being undefeated as a pair, they declined to confirm that they would definitely team up again with Hingis saying she would assess which tournaments she wants to play at the end of the season.
Hingis, who reached No. 1 in the rankings and won five Grand Slam singles titles in the 1990s, initially quit tennis in 2002 because of foot and leg injuries, then rejoined the circuit full-time in 2006.
Asked why his game was so well suited to mixed doubles, Murray said: "I think my serve and the skills I have at the net lends itself to mixed doubles".
It is clearly a partnership that works but Hingis was non-committal on court as to whether they would play together in Australia and bid for a third straight title.
"Obviously a lot of money has been pumped into the Grand Slams over the last few years and people are making a lot more money than they used to, but a majority of that is going into the singles game", Murray said.
Venus's main focus at Flushing Meadows had ben the men's doubles but he and Harrison lost in the first round, denting their shot at qualifying for the year-ending ATP finals.
"It was an wonderful feeling to play here in the singles final", Hingis said of her 1997 Arthur Ashe Stadium finals debut.
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Both players are competing for their first major title.
In July, she and her Romanian partner Monica Niculescu were overwhelmed in the women's doubles final at Wimbledon.
Keys is 22; Stephens is 24.
"I did play a lot of mixed doubles when I first started playing and had a lot of success".