With no explanation, label each line with "O", "person-athlete", "event-sportsevent", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
This
was
the
final
ATP
tour
singles
match
of
Sampras
's
career
.
This:O
was:O
the:O
final:O
ATP:event-sportsevent
tour:O
singles:O
match:O
of:O
Sampras:person-athlete
's:O
career:O
.:O