Barcelona in the semi final of the Copa Del Ray 2nd leg 12/13, AC Milan at home in the group stage 10/11, Juventus at home and away 13/14, City away 12/13, Atletico away 11/12, Atletico at home 12/13 (countless game vs Atletico tbh), Barcelona at home 10/11, Barcelona Copa Del Ray final 10/11, Barcelona Spanish Super Copa second leg at home 12/13, Barcelona away 11/12, Barcelona away 12/13, Barcelona away in the second leg of the Copa Del Ray 11/12, Bayern at home 11/12 and provided an assist in the first leg away in what was a quiet game from him and a poor performance from Madrid, Bayern away 13/14 and in the home game provided a great pass to Coentrao to set up Benzema after he returned from injury and was still playing injured, first half vs United at home in 12/13 before they put Phil Jones on him and had him double and sometimes triple marked, Dortmund at home in the CL quarter finals 13/14, Atletico away in the second leg of the Copa Del Ray semi final 13/14, Tottenham at home in the CL quarter finals 10/11 (a Gareth Bale inspired side that seen them top a group with Inter and knocked AC Milan out in the last 16 by beating them away). They are all games that he performed well in (maybe I missed a few) with perhaps the second leg of the Copa Del Ray 12/13 away to Barca in 12/13 being the best. He holds the record for most consecutive Clasico's scored in also.
There are other games that he has not performed so well in that he still managed to score a goal or grab an assist in and that is part of what makes him so great and is a big reason why he is the second best player of his generation and the best player in the world right now continuing on from last year. I am sure United fans can tell me some more from his time there and I remember his performances vs Chelsea in the CL final, Arsenal away in the CL semi final 08/09, Inter at home 08/09, Chelsea at home 08/09, Roma away 07/08, Porto away 08/09, Liverpool at home 07/08 were good games from him that I remember watching.