"sustained competition" is a correct and usable phrase in written English.
You can use it to indicate that competition between two individuals or groups is ongoing. For example, you could say: "The sustained competition between the two companies has led to significant advances in technology."
While National Journal has published daily editions at the political conventions since 1984, it faced little sustained competition before this year.
Democrats scored temporary gains in the elections of 1910 and 1912 and, during the Great Depression, in the elections of 1932 and 1934, but it was not until 1954 that sustained competition began to develop between the two major parties.
"There was definitely an intent to send a signal to the bureaucracies on both sides that any kind of downward spiral into overt and sustained competition would not be in either side's interest," said one senior American official who participated in some of the meetings.
The "high intensity (HI)" cultural treatment included even greater nutrient inputs and complete sustained competition control.
Snapchat face-planted in its Q1 2018 earnings report amidst a rocky redesign and sustained competition from Facebook, unable to keep up its comeback from last quarter.
Bayern Munich have little sustained competition in the Bundesliga and, although Borussia Dortmund are on their way back and Wolfsburg are trying to build something, Bayern look set to dominate for the foreseeable future.
To sustain competition, it is necessary for designers to contrive changes in a product.
It will be Facebook, with maybe 2-3 local social networks able to sustain competition long term.
To sustain competition, organizations are expanding their businesses into new and uncharted markets by undertaking domestic as well as international projects.
I have written that as a matter of national security, we must educate our entire workforce to become STEM literate and proficient in 21st century skills and build a futuristic infrastructure that can sustain competition in a global economy if we are to avoid further economic and societal decline.
According to a study conducted by the British Journal of Sports Medicine, published in 2014, ski jumping is safer than most Winter Olympic sports, judged by injuries sustained in competition.
