"effortless win" is correct and usable in written English
You could use it when referring to an easily achieved victory. For example, "The team was unfazed by the competition and experienced an effortless win."
The talent gap was illustrated by Kramnik's almost effortless win over Anish Giri in Round 5. Kramnik, at age 36, was bound to be well versed in any opening that Giri, who is just 17, would choose.
The horse owned by Ahmed Zayat offered a glimpse of good things to come with an effortless win at the Arkansas Derby in April, prompting Jill to say, "I'd better get a dress".
The horse went back on everyone's radar with a seemingly effortless win in the Los Alamitos Futurity in mid-December against a better-than-average field of 2 year olds.
Friday's effortless 6-1 win over Armenia in the last friendly before the World Cup finals did leave some happy faces behind in Mainz, but the national manager boarded the plane to Brazil with a fresh, deep furrow on his forehead.
Her win looks effortless, inevitable.
Calleja, as Riccardo, has effortless virtuosity and winning presence, which did much to bring life to the production.
Perelman, a fabled reader, told me he had once written the grand old man of British letters to express admiration for his effortless style, and won a similar mash note in return.
Despite a spluttering start, O'Sullivan eased up through the gears and finished off in sensational form with two centuries and effortless break-building to secure his first match win at a major tournament for six months.
"I think his fall win streak is testament to his intact talent, the effortless aspect of his game compared to his peers and intelligent scheduling.
But the following hotels and airports are betting that they will win over increasingly health-conscious travelers who want practical, effortless solutions, not spa and boot camp vacations.
It certainly never appeared possible in any point during the three-time U.S. Open champion's effortless 6-0, 6-1 second-round victory over 183rd-ranked Michaella Krajicek, a win that improved her 2011 hard court record to 14-0.
