He won the singles title at the Dutch Tennis Championships in 1909, 1910 and 1911. At the same tournament he won the men's doubles title in 1909 and 1912 and the mixed doubles title in 1906 and 1911.[2]
He participated in the Wimbledon Championships in 1909 and 1910. In 1909 he lost in the first round of the singles event to George Coulson and also lost in the first round of the doubles event. In 1910 he reached the fourth round in the men's singles event in which he lost to Arthur Lowe. In the doubles event he partnered Sirdar Nihal Sing and reached the second round.[3]
Poule
Louis Trasenster 1 *
Otto Blom
6-1
6-2
Poule
Otto Froitzheim 1 *
Otto Blom
7-5
6-2
4-6
6-3
Poule
Maurice Germot 1 *
Otto Blom
8-6
6-2
Poule
Rudolf (Rolf) Kinzl 1 *
Otto Blom
6-3
6-4
7-5
Poule
Otto Salm 1 *
Otto Blom
6-3
5-7
6-4
Poule
Oscar Kreuzer 1 *
Otto Blom
6-2
6-0
Poule
Paul de Borman 1 *
Otto Blom
6-2
4-6
6-4
6-3
Round 1
Otto Blom 1 *
Benjamin De Jong van Beek en Donk
6-0
6-2
Round 2
Otto Blom 1 *
Marinus Emmarikus Van der Wall
6-2
6-4
Quarterfinals
Otto Blom 1 *
Hugo Victir Benjamin Wijnmalen
6-2
6-2
Semifinals
Otto Blom 1 *
R. Van Steeden
6-2
6-2
Final
Otto Blom 1 *
Roelof van Lennep
4-6
6-3
10-8
4-6
6-0