Japan's economy grew 0.3 percent in real terms in the April-June period from the previous quarter, the government said Friday, marking a surprise downward revision from the initially reported expansion of 0.4 percent.

The pace of growth, measured in terms of gross domestic product, translates into an annualized 1.3 percent, downgraded from the earlier estimated 1.7 percent, the Cabinet Office said.

The data suggest that Japanese economic growth has begun to slow, putting a damper on the government's upbeat scenario that the world's second-largest economy will continue to remain on a recovery track.