The phrase "a significant rival to" is correct and usable in written English.
It can be used when discussing competition between entities, such as companies, products, or individuals, highlighting the importance of the rivalry.
Example: "In the tech industry, Company A has emerged as a significant rival to Company B, challenging its market dominance."
Alternatives: "a major competitor to" or "a formidable opponent to".
During the second half of the 12th century, a more significant rival to Byzantine power in the Balkans emerged in the Serbian Nemanjić dynasty.
"What keeps me up at night isn't what our traditional competitors are doing, but that someone we didn't foresee will use technology to emerge as a significant rival".
Salmon's work created a sensation, since Hempel's dominance of the philosophy of science, especially in relation to the theory of explanation, now had a significant rival.
Considering that the King James Version lacked a significant rival for three centuries, one could question the necessity of so many versions.
Following the withdrawal of such a significant rival, Postponed hardened as favourite for the International and is no bigger than 11-10, having been 2-1 on Wednesday morning.
De Bromhead's team includes Heron Heights (3.55), a significant rival for Tiger Roll, while another Irish raider with a big chance is Charles Byrnes Black Warriorr (2.10) in the opening novice hurdle, a race which was won by the top-class hurdler The New One four years ago.
The latter has made the UFIR estimator a significant rival of the Kalman filter and its applications can be found in [10, 21]‐[24].
The early functionalist theories of Putnam (1960 , 1967 can be seen as a response to the difficulties facing behaviorism as a scientific psychological theory, and as an endorsement of the (new) computational theories of mind which were becoming increasingly significant rivals to it.
This, in turn, will make YouTube a significant threat to rival streaming services like Twitter's Periscope and Facebook Live.
