It's first against second in the Ladbrokes Premiership on Saturday as Celtic welcome Aberdeen to Parkhead, live on Sky Sports at 12.30pm.
Ronny Deila's men were beaten 2-1 at Pittodrie earlier in the season but the Dons have failed to win any of their last four matches, allowing Celtic to build a four-point advantage.
Aberdeen's last league victory in the East End of Glasgow was 3-2 in October 2004 - John Stewart scored a last-minute winner - but they have won twice there in the Scottish Cup since.
Third-placed Hearts, unbeaten in four Premiership matches, head along the M8 to face Partick Thistle at Firhill. The Jags have taken seven points from nine to move off the foot of the table.
Ross County go to Tannadice boosted by their midweek League Cup victory at Inverness while Dundee United find themselves four points adrift at the bottom of the table and are still without a home win.
Hamilton Accies in fifth, host a St Johnstone team just one point and one place below them in the table. Martin Canning's men have drawn their last two matches while Saints were 3-1 winners at Morton in the League Cup in midweek.
Inverness Caley Thistle have the chance to leapfrog Dundee when the teams meet in the Highland capital. However, John Hughes' team have lost their last two Premiership matches while the Dark Blues are looking to bounce back from a home defeat to Kilmarnock.
Kilmarnock have recovered from a poor start to the season to win four of their last six matches ahead of the visit of Motherwell to Rugby Park. Mark McGhee's men earned a 1-1 draw at Aberdeen last weekend.