The dollar retreated on Monday against major peers as a wave of M&A deals lifted the mood on global equity markets and investors looked ahead to an event-packed week which includes a Fed meeting and the appointment of a new Japanese premier.
The yen meanwhile rose 0.13% to around 105.9 yen to the dollar, a five-day high. The Bank of Japan's meeting on Thursday is not expected to yield any policy changes but it may be quizzed on whether it could follow the Fed's inflation stance.
The Reuters Tankan survey on Monday found Japanese manufacturers pessimistic for the 14th straight month in September, underlining the challenge the country's next leader faces after the economy sunk into its deepest recession ever.
Chief Cabinet Secretary Yoshihide Suga became head of Japan's ruling party on Monday and is poised to become prime minister on Wednesday, succeeding Shinzo Abe. Because Suga has vowed to continue Abe's policies, radical changes are considered unlikely.
"The focus is on the line-up of his cabinet as well as whether he will call a snap election," said Minori Uchida, chief FX strategist at MUFG Bank. "He is saying he will continue and advance 'Abenomics' but it is questionable how much advancement he can make."
The Chinese yuan opened at 6.8344 to the US dollar before rising to 6.8156.
Meanwhile, attention focused on the pound as the UK parliament prepared to debate a draft bill which the government admits breaches the terms of its EU divorce treat. The currency firmed 0.4% versus the dollar after suffering its worst week since March.
The gain was partly down to the dollar index which slipped 0.2%, after firming for two weeks straight.
This week's US Federal Reserve meeting will be its first since Chairman Jerome Powell unveiled a policy shift towards greater inflation tolerance, effectively pledging to keep rates low for longer.
"There will be pressure on the Fed to back up the new policy goals with some action," said MUFG strategist Lee Hardman, noting inflation remained well below target.
"Expectations are they could strengthen forward guidance, possibly by saying rates will be on hold for 3-4 years," said Hardman, who remains bearish on the greenback.
Speculators trimmed net short dollar positions for the second straight week to $32.67 billion, according to Reuters calculations and Commodity Futures Trading Commission data. That's off nine-year highs of $33.68 billion in late August
Analysts at Standard Chartered said there was a risk the Fed would disappoint dollar bears.
"Having set aside yield curve control as a near-term policy option, the FOMC does not seem to have an operational consensus on how to use the balance sheet," they told clients. "This may disappoint investors."
The data showed net euro longs inched higher but remained off record highs touched a few weeks ago.
The single currency had spiked to a one-week high above $1.191 after Thursday's European Central Bank meeting before easing back as policymakers talked it down the next day.
It was up around $1.186 on Monday <EUR=EBS>.
(Reporting by Sujata Rao, additional reporting by Hideyuki Sano in Tokyo; Editing by Susan Fenton)