Pedro scored an away goal as Chelsea recovered from an early setback against Eintracht Frankfurt to set up an exciting Europa League semi-final return leg at Stamford Bridge.
Eintracht took the lead through their top scorer Luka Jovic, who superbly steered in Filip Kostic's ball.
The Blues, who started with Eden Hazard on the bench, equalised when Pedro thrashed home just before half-time.
David Luiz also went close when his dipping free-kick came off the bar.
The second leg is on Thursday, 9 May.