The closest observation to a pair

Below you see a pre-calculated distance matrix between four players on a soccer field. You can clearly see that players 1 & 4 are the closest to one another with a Euclidean distance value of 10.

1 2 3
2 11.7
3 16.8 18.0
4 10.0 20.6 15.8

If 1 and 4 are the closest players among the four, which player is closest to players 1 and 4?