LONDON, July 21 (Reuters) - Emerging assets firmed on Tuesday to hover at their strongest levels in 10 months with growing hopes for a global economic recovery bolstered by a so far better-than-expected run of corporate earnings. Most high-yielding currencies were weaker on profit-taking with the Polish zloty backing off from the three-month high it hit against the euro in the previous session. Investor caution ahead of Federal Reserve Chairman Ben Bernanke's congressional testimony later in the day moderated emerging shares, which have risen some 12 percent in a week. But the positive note struck by forecast-beating second-quarter results from companies ranging from European drug firms to U.S. financial firms is expected to provide some support for sentiment. By 1150 GMT, emerging shares edged 0.4 percent higher to 810.05, their highest level since Sep. 29 last year, while emerging sovereign debt spreads narrowed 5 basis points to trade at the key 400 basis points over U.S. Treasuries level, last seen late September.

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