Anderlecht could relinquish pole position in the race for the Jupiler Pro League title after it played out a goalless draw at Standard Liege.
The stalemate edged Anderlecht two points clear in the six-team Championship play-off, but Zulte-Waregem could displace it with victory at Genk tomorrow.
Sporting Charleroi and Gent lead the UEFA Europa League play-off groups after differing fortunes.
Charleroi thumped OH Leuven 3-0 to go top of Group B. David Pollet's 22nd-minute penalty was followed by a
Waasland-Beveren joined Leuven in second place, a point behind Charleroi, with a 1-0 win over 10-man Mechelen.
Gent remained top of Group A but only after it held on for a 0-0 draw at KV Kortrijk with 10 men.
Mons moved up to second with a 2-1 home win against Lierse.
Cercle Brugge kept alive its bid to beat the drop in its five-game relegation play-off against Beerschot with a 1-0 win.
Beerschot started the series with a three-point advantage due to its higher league position and, after winning the opening game 1-0 last weekend, would have moved to the brink of avoiding automatic relegation with a win.
Instead Cercle hit back thanks to William's 11th-minute goal.
Tom De Sutter's second-half double and a clean sheet from Mat Ryan ensured Club Brugge kept the pressure on Pro League leader Standard Liege.