Following their shock prevail upon Germany, Japan were baffled by a tight guarded unit, before Fuller hit with Costa Rica's previously shot on track at the competition.
The outcome leaves the two groups on three focuses after two games, with Spain - who actually top the gathering on objective contrast - confronting Germany later on Sunday (19:00 GMT).
Triumph for Spain will everything except ensure their movement to the last 16.
How Japan 0-1 Costa Rica unfurled
In the wake of beating Germany in their opener, many anticipated that Japan should represent a Costa Rica side faltering from a 7-0 whipping by Spain.
In any case, Japan manager Hajime Moriyasu picked turn over coherence, rolling out five improvements, and that brought about a repressed exhibition and a scoreline that completely exposed the gathering.
It was a striking triumph for Costa Rica, who had neglected to lay a glove on the Japan safeguard before Fuller's diverted shot from the edge of the crate got away from goalkeeper Shuichi Gonda's grip a little ways from time.
After a first half without goalmouth activity in the singing intensity at Ahmad Container Ali Arena, Japan overwhelmed for enormous spells. Nonetheless, they attempted to make obvious possibilities until the 88th moment, when Daichi Kamada couldn't turn the ball home after a driving Kaoru Mitoma run.
Having accomplished reclamation following their embarrassment because of Spain, the Costa Rica players celebrated genuinely at full-time as Japan were passed on to lament a disheartening showcase that neglected to back up their heroics against Germany.
Fifa World Cup: Gatherings and timetable
World Cup television inclusion guide
Player of the match
Mitoma
with a normal of7.49
Japan
Japan
Costa Rica
Costa Rica
Avg
Crew number9Player nameMitoma
Normal rating
7.49
Crew number5Player nameNagatomo
Normal rating
6.54
Crew number4Player nameItakura
Normal rating
6.54
Crew number22Player nameYoshida
Normal rating
6.52
Crew number8Player nameDoan
Normal rating
6.47
Crew number18Player nameAsano
Normal rating
6.40
Crew number6Player nameEndo
Normal rating
6.37
Crew number15Player nameKamada
Normal rating
6.34
Crew number2Player nameYamane
Normal rating
6.25
Crew number24Player nameSoma
Normal rating
6.16
Crew number10Player nameMinamino
Normal rating
6.11
Crew number21Player nameUeda
Normal rating
6.02
Crew number13Player nameMorita
Normal rating
6.02
Crew number14Player nameIto
Normal rating
5.68
Crew number26Player nameIto
Normal rating
5.61
Crew number12Player nameGonda
Normal rating
4.99
Line-ups
Match Details
Live Text
Home TeamJapanAway TeamCosta Rica
Ownership
Home57%Away43%
Shots
Home13Away4
Shots On track
Home3Away1
Corners
Home5Away0
Fouls
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