Manchester City must avoid defeat at 10-time European football champions Real Madrid to reach their first Champions League final after a cagey scoreless first leg draw in Manchester.
Chances were scarce for either side in a game Real's Portugal superstar Cristiano Ronaldo missed because of a thigh injury.
Real pressed in the final quarter as City's England goalkeeper Joe Hart denied Casemiro and Pepe.
The home side failed to register a shot on target until injury time, when Kevin de Bruyne's free-kick was tipped over by Real stopper Keylor Navas.
City will be happy not to have conceded an away goal against a free-scoring Madrid team, albeit missing their most potent weapon in Ronaldo, but know they will need a monumental defensive effort to keep out the Spanish giants at the Santiago Bernabeu next week.
The winners will play either Atletico Madrid or Bayern Munich in the final at the end of next month. Those two clubs face off in their first leg semi-final on Thursday morning in Madrid.