Antoine Semenyo and Rayan Cherki both scored as Manchester City took control of their Carabao Cup semi-final against holders Newcastle United.
Semenyo only completed his £65m move from Bournemouth less than a week ago, but the new arrival has already made a huge impact.
After netting one and setting up another on his debut, in the club record-equalling 10-1 rout against Exeter City at the weekend, the forward stepped up with a crucial opener in the first leg of this semi-final at St James' Park.
Semenyo, who later had a goal disallowed, was in the right place at the right time to convert at the back post after Jeremy Doku's cross was hooked on by Bernardo Silva.
Newcastle's evening got worse deep into stoppage time when substitute Cherki doubled his side's advantage after lashing the ball into the net.
Manchester City, the eight-time winners, now take a commanding lead back to the Etihad when these sides meet again in the return fixture on 4 February.
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