The Dearborn, Michigan-based company sold 589,709 Focuses from January to June across the globe.
The numbers reveal a 20 percent increase over the first half of last year, Erich Merkle, Ford's top sales analyst, said.
According to news.com.au, Ford said that the Focus beat the perennial No. 2 Toyota Corolla.
A Polk spokeswoman confirmed the number provided by Ford was accurate but declined further comment.
If the Focus beats Corolla for all of 2013, it would be the second year in a row Ford lays claim to the top honours, the report said.
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Merkle said the Focus' gains are largely due to China, where sales more than doubled to 202,380 in the first half of the year.
A new version of the Focus has been on the market only about a year in China, and it's considered a new product there, it added.