An informal poll by the United Nations Security Council placed former Costa Rican Vice President Rebeca Grynspan as the ‌frontrunner in the race to become the 10th UN secretary-general, sources close to the process said ↧ Costa Rica's Grynspan narrowly ahead in race to be next UN chief, s... An informal poll by the United Nations Security Council on ​Tuesday placed former Costa Rican Vice President Rebeca Grynspan as the ‌frontrunner in the race to become the 10th UN secretary-general, sources close to the process said.