While Sarr's two goals grabbed the headlines, Premier League Champion Alan Shearer also picked out Deeney, who "bullied Liverpool's centre-back pairing".
Sarr and Deeney were among five Watford players named in Shearer's Matchweek 28 Team of the Week.
A rock at the back again, Cahill has been a brilliant free transfer and integral to Palace's defensive solidity this season.
Another two goals, making it three in his last two league appearances, to get his team an all-important point in the top-four race.
The Frenchman bossed the middle of the park, playing a key role in stifling the leaders.
The 24-year-old was too good for Liverpool on the day. His creativity paved the way for three great goals.
Sarr ran the title favourites ragged, scored two fantastic goals and provided an assist in an outstanding individual performance.
Marked his first Premier League start for the club with a goal that was thoroughly deserved. His tireless pressing and tenacity up front made for a tough time for Southampton.
Haller scored a hugely important goal and produced a much-improved all-round performance compared with recent showings. Perhaps a sign of things to come.
Wow, what a win. His Watford team deservedly ended Liverpool's 44-match unbeaten run and the head coach's tactical set-up was perfect. It also took the Hornets out of the relegation zone and on this form they should steer clear of the bottom three.