West Java's incumbent governor Ahmad Heryawan won Sunday's highly contested gubernatorial race according to quick-count results released by several polling companies.

Ahmad and his running mate Deddy Mizwar, both of the Islamist Prosperous Justice Party (PKS) garnered 32.38 percent of the votes, according to unofficial IndoBarometer estimates broadcast by Metro TV on Sunday.

The incumbent pair faced a tough race against the Indonesian Democratic Party of Struggle's (PDI-P) Rike Diah Pitaloka and Teten Masduki, who earned 27.18 percent of the vote according to unofficial counts. The PDI-P candidates rode a wave of support from workers in West Java, but failed to unseat the incumbent party.

The Democratic Party's Dede Yusuf and Lex Laksmana took home 26.09 percent of the vote. The Indonesian Voting Network (JSI) reported similar figures.

Analysts focused on the region's large percentage of undecided voters and high-profile corruption scandals involving the PKS and the Democratic Party as possible deciders in the election. Ahmad's close ties with hard-line Islamic groups was also said to put off moderate Muslim voters.

But according to unofficial counts, Ahmad was able to sweep the race in one round. "Ahmad and Deddy's votes will remain steady," Fajar S. Tamim, executive director of JSI, told Antaranews.com. "They definitely won the West Java election in one round."

Ahmad recently signed a deal with the hard-line Islamic Defenders Front (FPI) promising to ban the minority Ahmadiyah sect in exchange for their support in the election. The Islamist governor said he was interested in preserving an "Islamic environment" in West Java, but did not plan to enact Shariah-based bylaws.