With no explanation, label each line with "organization-sportsteam", "event-sportsevent", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
The
South
African
competed
in
the
men
's
doubles
at
six
Grand
Slam
tournaments
during
his
career
,
including
all
four
in
2001
.
The:organization-sportsteam
South:organization-sportsteam
African:organization-sportsteam
competed:O
in:O
the:O
men:O
's:O
doubles:O
at:O
six:event-sportsevent
Grand:event-sportsevent
Slam:event-sportsevent
tournaments:event-sportsevent
during:O
his:O
career:O
,:O
including:O
all:O
four:O
in:O
2001:O
.:O