The BlackRock Inc. money managers who correctly predicted this year’s bumper inflows into emerging-market debt are now reining in bullish bets.

Returns from emerging market debt will slow to between 2 and 3 percent in the rest of the year, according to a note by Pablo Goldberg and Sergio Trigo Paz, who run the emerging market fixed-income team at the world’s biggest fund manager.

“We believe the engines that took EM higher during the first half of the year are likely to lose thrust in the second half,” Trigo Paz and Goldberg said in an emailed research note. “We might be slowly entering a period of quantitative tightening that the bond market might have to learn to digest.”

(Related: Tactical Investing Tips Advisors Can Use Now)

Bonds of developing nations have become a magnet for yield-starved investors this year after the U.S. Federal Reserve signaled it will raise interest rates only gradually. More than $40 billion of new investment has flooded into emerging-market debt funds during 21 straight weeks of inflows, according to Bank of America Merrill Lynch research citing EPFR Global data.

Monetary policy divergence between the Federal Reserve and other major central banks will have important implications for emerging market currencies and may bring more volatility, the BlackRock strategists said. Hard-currency sovereign or lower-duration corporate debt should be favored as the U.S. dollar may strengthen.

Emerging market debt should continue to attract inflows as carry remains attractive in a world of yield scarcity, the strategists said. Switching from index-tracking to active management can “more efficiently” capture opportunities as volatility rises in the second half.

More flexibility when choosing between investment grade and high yield in local debt, and close attention to shifts in the U.S. curve, offer the “potential to maximize excess returns for the rest of the year,” the strategists said.

— Check out MSCI to Add China A Shares to Emerging Markets Index: What It Means for Investors on ThinkAdvisor.

Copyright 2018 Bloomberg. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.