The phrase "a serious competitor for" is correct and usable in written English.
It can be used when discussing entities or individuals that are competing for a position, title, or market share in a particular field or industry.
Example: "With its innovative technology and strong marketing strategy, the new startup is a serious competitor for established companies in the tech industry."
Alternatives: "a formidable rival to" or "a strong contender for".
And which, as of now, has a serious competitor for the hearts of New York moviegoers.
The subsequent S-6 series established Sikorsky as a serious competitor for supplying aircraft to the Russian army.
There was no guarantee that a Microsoft-owned Yahoo! would have become a serious competitor for Google, but at least it would have stood a fighting chance.
Like The Associated Press, Reuters is a global news service, founded in the mid-19th century, with thousands of journalists, but it differs to an extent that Reuters cannot be seen as a serious competitor for United States clients.
Tokyo-based Solid Alliance is slowly but surely evolving into a serious competitor for Thanko in the wacky gadget department.
These are substantial improvements that promise to help complete projects faster and keep the Mac platform a serious competitor for high-speed computing applications.
Along with other Marsalas that are flavored for the mass market with chocolate or egg, it debases Marsala's historic reputation as a serious competitor of premium sherry.
It's becoming a serious competitor to YouTube for video viewing, it's building ways to attract users in the developing world, it's giving every more ways to share than just the News Feed, it's solidifying itself as the way to invite people to birthday parties and big ticketed events, and businesses are using it to host communication with customers.
"D2E7 is clearly a very serious competitor for Enbrel," said Matt Geller, an analyst at CIBC World Markets, citing the convenience factor.
With the advent of Russian team owners such as the billionaire Roman Abramovich, who also owns the English soccer team Chelsea, the top Russian league is emerging as a serious competitor to the N.H.L. for European talent, especially with N.H.L. owners facing tight spending guidelines.
Amazon's had its own music service for some time, as well, but the company appears to have given up on the dream of being a serious competitor in the space — for now, at least.
