Thomson Reuters Corp reported a 10 percent rise in third-quarter profit, beating market estimates, as revenue grew and margins expanded, though growth in its Markets division remained sluggish.

The news and data provider, which has announced several reorganizations in recent months to boost revenue in the division, reaffirmed its outlook for 2011.

Total revenue was $3.26 billion (2.04 billion pound), up 5 percent before currency changes. Analysts had expected revenue of $3.23 billion, according to Thomson Reuters I/B/E/S.

The revenue increase was driven by growth in the company's Professional division, which mainly serves clients in the legal and tax and accounting sectors. Revenue in that division increased 10 percent after growing 8 percent in the second quarter.

Growth in the Markets division, which serves financial professionals, rose just 1 percent, matching the rise in the second quarter.

The company said in September that it planned to merge the Professional division with its Markets division, which has struggled in part due to the slow uptake of the company's new flagship Eikon desktop product.

Adjusted earnings per share rose to 56 cents from 45 cents in the same quarter last year. Analysts had expected earnings of 53 cents per share.

Thomson Reuters said it still expects revenue to grow by a mid-single digit percentage rate in 2011.

(Reporting by Jennifer Saba; Editing by Ted Kerr)