competition for

[rainous]

“Moneyball” is an exuberant fictionalized look at how Mr. Beane helped transform the team, one of the poorest in baseball, into serious competition for the wealthiest franchises, mostly by ignoring everything he’d been taught about the game.

-transforming the team into serious competition for the wealthiest franchises-

Shouldn't there be an article in front of "serious" since the word "competition" seems to mean "the team that has been transformed" according to the context?

[emsr2d2]

“Moneyball” is an exuberant fictionalized look at how Mr. Beane helped transform the team, one of the poorest in baseball, into serious competition for the wealthiest franchises, mostly by ignoring everything he’d been taught about the game.

-transforming the team into serious competition for the wealthiest franchises-

Shouldn't there be an article in front of "serious" since the word "competition" seems to mean "the team that has been transformed" according to the context?

Here "serious competition" means "worthy opponent" but needs no article. "Competition" does not mean "the team", it refers to the team's ability to beat the teams who have a lot more money.

Roger Federer is serious competition for Rafael Nadal at the moment = Each time they play, there is a strong possibility that Roger Federer may win even though Rafael Nadal has been the stronger player recently.

[rainous]

Here "serious competition" means "worthy opponent" but needs no article. "Competition" does not mean "the team", it refers to the team's ability to beat the teams who have a lot more money.

Roger Federer is serious competition for Rafael Nadal at the moment = Each time they play, there is a strong possibility that Roger Federer may win even though Rafael Nadal has been the stronger player recently.

Thanks for clearing that up.

Then, is it at least possible to add an article 'the"
to mean "the contestant others want to defeat" as another option?

[emsr2d2]

If you are suggesting:

"... helped transform the team, one of the poorest in baseball, into the serious competition for the wealthiest franchises ..."

then, no, that's not possible.

"Competition" is not being used as the noun "an event in which players or teams compete against each other".

Look here and look at Noun:1 at the very top of the page and the example they give about banks.

"There is fierce competition between banks."
"The Dallas Cowboys are serious competition for the Kansas City Chiefs."
"There will be strong competition between the French and the Spanish teams at the Olympics."

In none of those cases would an article be appropriate, because we are not talking about a specific competition (contest), we are talking about how competitive those teams will be against each other as a general situation.

"I want to apply for the job of Managing Director but I have some serious competition from people in other departments."