The phrase "a significant player with" is correct and usable in written English.
It can be used to describe someone or something that plays an important role in a particular context or industry, often in relation to collaboration or partnership.
Example: "The company has established itself as a significant player with various tech startups, driving innovation in the industry."
Alternatives: "a key contributor to" or "an important participant in".
When I asked about how MoPub's publisher business would fit in at Twitter, he compared it to Google and its ad acquisition DoubleClick: "Google was doing a great job monetizing their own properties, but in order to really be a significant player with scale, breadth, reach, and frequency [on other sites], they needed DoubleClick.
Indeed, we anticipate that RF1 deficient chassis strains will achieve greater than 1g/L yields in the upcoming years, becoming a significant player on the stage with other CFPS technologies for synthesis of unnatural biopolymers with high efficiency and high fidelity.
In terms of the show's structure, Jeannie, who spent the early episodes mostly making wisecracks and being the comic foil for male characters, gradually emerged as a significant player, ending the season with a back story almost as rich as Marty's.
Jay-Z's banner is primed to be a significant player in the field with significant access to multiple areas that could benefit an athlete.
"To question why the UK needs an aircraft carrier is to ignore the realities of being a significant player on the global stage with peacetime, wartime and humanitarian responsibilities", its says.
During the past year Relativity's television business, Relativity Real, has also grown significantly with over 60 shows on-air or as pilots, making them one of the biggest unscripted studios, as well as a significant player in the scripted space, with 5 scripted shows this year alone.
Hersch says he knows of a significant player who "is out talking with major companies and is offering profit participation and very significant advances".
Once it gets going, "Microsoft will be a significant player, but one chasing a leader with a multi-year head start".
In academic research we are a "significant player in the European Space Agency science programme," with a key role in a large number of areas, including earth observation, planetary exploration, and studies of the sun.
Microsoft has up to now not really been a significant player in open-ended social networking, although with products like Yammer and Skype it's clearly put a lot of investment into the kinds of collaboration products that are in demand from enterprises and business users today.
"We'll have a player with a chance to play this year and a chance to be a significant player down the line".
