With no explanation, label each line with "person-athlete", "event-sportsevent", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Naumann
appeared
in
the
mains
draws
at
two
Australian
Open
tournaments
.
Naumann:person-athlete
appeared:O
in:O
the:O
mains:O
draws:O
at:O
two:O
Australian:event-sportsevent
Open:event-sportsevent
tournaments:O
.:O