Although short of his world-leading 71.37m set in August, the result was enough for him to edge Andrius Gudzius of Lithuania (68.22m), who had ended Stahl's unbeaten run in Berlin, and set a new meeting record.
Nishikori needed six match points to seal the win in two hours at the ATP Masters event held behind closed doors at the Foro Italico.
The first half of the fixture played in the north of Europe did not bring many scoring chances.
Ohaga also ruled that FKF president Nick Mwendwa had no powers to announce the end of the league season, owing to the unavailability of his National Executive Committee (NEC), whose term of office expired in February.
The Celta captain opened the scoring from Nolito's pass after 15 minutes in an entertaining match which saw Celta play some impressive football.
Second seed Karolina Pliskova of the Czech Republic also met little trouble in her 6-4, 6-3 win over Russia's Anna Blinkova.
Li Ang netted a right-sided free-kick on 74 minutes to put the game beyond doubt, with a sweet finish for Suning.
He said Schalke's squad needs to forget about last season's disappointments and try to start afresh. "There is no specific goal for the new season besides doing better," the attacker said.
"We will make table tennis events and activities more attractive to the media, giving the sport greater global exposure. Our ultimate goal is to develop and improve table tennis worldwide, and spurred by my deep passion for the sport, I will do my best to make WTT a success," said the Chinese table tennis legend.
Both sides posed threats to the other, but no goals were scored in the first half. Chongqing once got a good chance to score in the stoppage time when Brazilian forward Fernandinho Silva was fouled by Cameroon midfielder Joseph Minala in the penalty area. After a VAR ruling, the referee finally canceled the penalty kick because of Fernandinho's handball.
"My buddy, I always believe you, support you and love you," Beijing teammate and Chinese international Zhai Xiaochuan wrote.