Among the following six greatest records of world football history, which is the most difficult to break ?
1.Pelé- Won three World Cup champion titles (1958, 1962, 1970)
2.Miroslav Klose- 16 goals totally in the World Cup
3.Just Fontaine- 13 goals in a single World Cup (Sweden World Cup 1958)
4.Lionel Andres Messi- 91 goals in 2012 (Top five leagues + national team)
5.Robert Lewandowski -- Bundesliga scored 5 goals in 9 minutes (Top five leagues)
6.Rogério Ceni - 131 goals in his goalkeeper career (1993 - 2015)