Oscar missed two second-half penalties as Shanghai SIPG lost at Urawa Reds 1-0 in the Asian Champions League on Tuesday.
Shanghai's first loss in Group F dropped it below new leader Urawa on goal difference.
Rafael Silva scored for Urawa at Saitama Stadium just before halftime, but they were on the back foot after the break.
Urawa goalkeeper Shusaku Nishikawa, however, was superb.
Midway through the second half, Oscar was fouled in the area. His penalty attempt was saved one-handed by Nishikawa.
Ten minutes later, Oscar had another penalty chance thanks to a hand-ball but skied a shot well over the crossbar. Another shot from the edge of the area was saved again.
Despite the loss, Shanghai was in a good position to finish in the top two of the four-team group as it was still six points clear of third-placed FC Seoul. There were two out of six matches left in group play.
Seoul picked up its first points by beating Western Sydney Wanderers 3-2. The Australian side scored its pair late.
Elsewhere, Lekhwiya of Qatar moved into first place in Group B with a 2-1 win over previous leader Esteghlal Khuzestan of Iran, while Saudi Arabian giant Al Hilal defeated Al Wahda of United Arab Emirates 1-0 to move above Qatar side Al Rayyan into top spot in Group D.