David Turnbull's free-kick in stoppage time earned Motherwell a 2-1 win over Hearts, a sixth consecutive league victory.
Scottish Cup holders Celtic will visit Hibernian in the quarter-finals, while Aberdeen will face either Kilmarnock or Rangers.
Scott Sinclair's second hat-trick of the season was the catalyst as Celtic thrashed St Johnstone 5-0 to claim a place in the Scottish Cup quarter-finals.
Top two Celtic and Rangers both won but Kilmarnock slipped up on a busy night of Scottish Premiership action.
Hearts have offered new contracts to Steven Naismith and Arnaud Djoum, manager Craig Levein confirmed on Tuesday.
Sky Sports Scotland commentary team Ian Crocker and Andy Walker take a look at the midweek Scottish Premiership fixtures.
Kilmarnock passed up the chance to go second in the Ladbrokes Premiership by succumbing to a 2-1 defeat by Hearts at Rugby Park.
Hearts defender John Souttar has signed a contract extension at Tynecastle until 2022.
| # | Team | Pl | GD | Pts |
|---|---|---|---|---|
| 3 | Aberdeen | 26 | 12 | 47 |
| 4 | Kilmarnock | 26 | 11 | 46 |
| 5 | Hearts | 26 | 1 | 43 |
| 6 | St J'stone | 26 | -5 | 38 |
| 7 | Motherwell | 26 | -6 | 36 |
| # | Team | Pl | GD | Pts |
|---|---|---|---|---|
| 1 | Hearts | 4 | 11 | 9 |
| 2 | Inverness | 4 | 1 | 9 |
| 3 | Cowdenb'th | 4 | -5 | 6 |
| 4 | Cove | 4 | -2 | 3 |
| 5 | Raith | 4 | -5 | 1 |
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