Just before half-time in Southampton’s home home with Arsenal last December, Sadio Mane clipped a lovely pass in behind Per Mertesacker to set up a chase for Shane Long. There was only going to be one winner – Long terrorised the Germany defender with his pace all day and had already had a goal harshly disallowed, but his attempted dink over Petr Cech had too much on it and sailed over the crossbar for a wasted opportunity.