Costa Rica's Grynspan narrowly ahead in race to be next UN chief, sources say

By Antoni Slodkowski UNITED NATIONS, Oct 16 (Reuters) — An informal poll by the United Nations Security Council on Friday placed former Costa Rican Vice President Rebeca Grynspan as the narrow frontrunner in the race to become the 10th UN secretary-general, two sources close ‌to the process said. (Reporting by Antoni Slodkowski; Editing by Chris Reese) ((antoni.slodkowski@thomsonreuters.com; +1-940-623-2413;)