Southampton manager Ralph Hasenhuttl tells BBC Sport: "First half good, second half disaster.
"We deserved to lose today because in the second half we have not been playing what we should be against this team. In the first half we showed we can compete as a team, the second half balls in behind was causing us problems and that is too easy. No chance to get something here.
"They came out and played more long balls in behind but the timing for us was horrible, we got caught too many times. The closing down was difficult in the second half and nothing worked quite well. It was deserved, they killed us in the second half."
Leeds manager Marcelo Bielsa tells BBC Sport: "The difference of the three goals is different to how it was between the two teams, even if I think the victory was deserved. Throughout the game it was difficult to establish differences between the two teams. Even if we had a good offensive game - we created double the chances they did - the dominance alternated.
"When the games are so close, the team that scores first gets the advantage. It is not definitive but has weight.
"Raphinha is a player very necessary because he can unbalance teams by himself. Our game is based on combinations and to have a player who can combine and create in individual actions, that is very important."