Which of these records do you think is the hardest to break or that might never be broken?
Robert Lewandowski: 5 goals in 9 minutes for Bayern Munich
Sadio Mane: 3 goals in 176 seconds for Southampton 
Cristiano Ronaldo: 17 goals in a single Champions League season for Real Madrid
Lionel Messi: 91 goals in a calendar year for Barcelona & Argentina
